diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index a5ccda1..d725b1f 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -48,4 +48,5 @@ dependencies {
     implementation("io.ktor:ktor-client-content-negotiation:$ktor")
     implementation("io.ktor:ktor-serialization-kotlinx-json:$ktor")
     implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.9.0")
+    implementation("androidx.datastore:datastore-preferences:1.2.0")
 }
diff --git a/app/src/main/java/ru/myitschool/work/data/repo/AuthRepository.kt b/app/src/main/java/ru/myitschool/work/data/repo/AuthRepository.kt
index db1293e..ce5d6e5 100644
--- a/app/src/main/java/ru/myitschool/work/data/repo/AuthRepository.kt
+++ b/app/src/main/java/ru/myitschool/work/data/repo/AuthRepository.kt
@@ -1,17 +1,19 @@
 package ru.myitschool.work.data.repo
 
-import android.util.Log
+import kotlinx.coroutines.flow.Flow
+import ru.myitschool.work.data.source.LocalDataSource
 import ru.myitschool.work.data.source.NetworkDataSource
-
 object AuthRepository {
+    suspend fun clearCode() {
+        LocalDataSource.setCode("")
+    }
 
-    private var codeCache: String? = null
-
+    val isCodePresentFlow: Flow<Boolean> = LocalDataSource.isCodePresentFlow
     suspend fun checkAndSave(text: String): Result<Boolean> {
         return NetworkDataSource.checkAuth(text).onSuccess { success ->
             if (success) {
-                codeCache = text
+                LocalDataSource.setCode(text)
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/ru/myitschool/work/data/source/LocalDataSource.kt b/app/src/main/java/ru/myitschool/work/data/source/LocalDataSource.kt
new file mode 100644
index 0000000..b6e84e8
--- /dev/null
+++ b/app/src/main/java/ru/myitschool/work/data/source/LocalDataSource.kt
@@ -0,0 +1,31 @@
+package ru.myitschool.work.data.source
+
+import android.content.Context
+import android.util.Log
+import androidx.datastore.preferences.core.edit
+import androidx.datastore.preferences.core.stringPreferencesKey
+import androidx.datastore.preferences.preferencesDataStore
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.map
+import ru.myitschool.work.App
+
+object LocalDataSource {
+    private val Context.dataStore by preferencesDataStore("user_data")
+
+    object Keys {
+        val CODE = stringPreferencesKey("Username")
+    }
+
+    private val appContext get() = App.context
+
+    suspend fun getCode(): String {
+        return appContext.dataStore.data.map { it[Keys.CODE] ?: "" }.first()
+    }
+
+    suspend fun setCode(code: String) {
+        appContext.dataStore.edit { it[Keys.CODE] = code }
+    }
+
+    val isCodePresentFlow: Flow<Boolean> = appContext.dataStore.data.map { it[Keys.CODE] != "" }
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/myitschool/work/domain/auth/CheckAndSaveAuthCodeUseCase.kt b/app/src/main/java/ru/myitschool/work/domain/auth/CheckAndSaveAuthCodeUseCase.kt
index 012fb6f..e76a418 100644
--- a/app/src/main/java/ru/myitschool/work/domain/auth/CheckAndSaveAuthCodeUseCase.kt
+++ b/app/src/main/java/ru/myitschool/work/domain/auth/CheckAndSaveAuthCodeUseCase.kt
@@ -1,6 +1,7 @@
 package ru.myitschool.work.domain.auth
 
 import ru.myitschool.work.data.repo.AuthRepository
+import ru.myitschool.work.App
 
 class CheckAndSaveAuthCodeUseCase(
     private val repository: AuthRepository
diff --git a/app/src/main/java/ru/myitschool/work/ui/root/RootActivity.kt b/app/src/main/java/ru/myitschool/work/ui/root/RootActivity.kt
index d373d0c..67de67e 100644
--- a/app/src/main/java/ru/myitschool/work/ui/root/RootActivity.kt
+++ b/app/src/main/java/ru/myitschool/work/ui/root/RootActivity.kt
@@ -7,19 +7,27 @@ import androidx.activity.enableEdgeToEdge
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.Scaffold
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.runBlocking
+import ru.myitschool.work.data.repo.AuthRepository
 import ru.myitschool.work.ui.screen.AppNavHost
 import ru.myitschool.work.ui.theme.WorkTheme
 
-class RootActivity : ComponentActivity() {
+class RootActivity() : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         enableEdgeToEdge()
         actionBar?.hide()
         setContent {
             WorkTheme {
+                val codePresence by AuthRepository.isCodePresentFlow.collectAsState(false)
+
                 Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
                     AppNavHost(
+                        codePresence = codePresence,
                         modifier = Modifier
                             .fillMaxSize()
                             .padding(innerPadding)
diff --git a/app/src/main/java/ru/myitschool/work/ui/screen/NavigationGraph.kt b/app/src/main/java/ru/myitschool/work/ui/screen/NavigationGraph.kt
index c83595e..58f52ef 100644
--- a/app/src/main/java/ru/myitschool/work/ui/screen/NavigationGraph.kt
+++ b/app/src/main/java/ru/myitschool/work/ui/screen/NavigationGraph.kt
@@ -5,12 +5,16 @@ import androidx.compose.animation.ExitTransition
 import androidx.compose.foundation.layout.Box
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.navigation.NavHostController
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import androidx.navigation.compose.rememberNavController
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+import ru.myitschool.work.data.repo.AuthRepository
 import ru.myitschool.work.ui.nav.AuthScreenDestination
 import ru.myitschool.work.ui.nav.BookScreenDestination
 import ru.myitschool.work.ui.nav.MainScreenDestination
@@ -19,14 +23,15 @@ import ru.myitschool.work.ui.screen.auth.AuthScreen
 @Composable
 fun AppNavHost(
     modifier: Modifier = Modifier,
-    navController: NavHostController = rememberNavController()
+    navController: NavHostController = rememberNavController(),
+    codePresence: Boolean
 ) {
     NavHost(
         modifier = modifier,
         enterTransition = { EnterTransition.None },
         exitTransition = { ExitTransition.None },
         navController = navController,
-        startDestination = AuthScreenDestination,
+        startDestination = if (codePresence) MainScreenDestination else AuthScreenDestination,
     ) {
         composable<AuthScreenDestination> {
             AuthScreen(navController = navController)
@@ -36,6 +41,8 @@ fun AppNavHost(
                 contentAlignment = Alignment.Center
             ) {
                 Text(text = "MAIN")
+//                LaunchedEffect(Unit) { AuthRepository.clearCode() }
+
             }
         }
         composable<BookScreenDestination> {
diff --git a/app/src/main/java/ru/myitschool/work/ui/screen/auth/AuthViewModel.kt b/app/src/main/java/ru/myitschool/work/ui/screen/auth/AuthViewModel.kt
index 9896bd9..1bbb431 100644
--- a/app/src/main/java/ru/myitschool/work/ui/screen/auth/AuthViewModel.kt
+++ b/app/src/main/java/ru/myitschool/work/ui/screen/auth/AuthViewModel.kt
@@ -14,7 +14,7 @@ import kotlinx.coroutines.launch
 import ru.myitschool.work.data.repo.AuthRepository
 import ru.myitschool.work.domain.auth.CheckAndSaveAuthCodeUseCase
 
-class AuthViewModel : ViewModel() {
+class AuthViewModel() : ViewModel() {
     private val checkAndSaveAuthCodeUseCase by lazy { CheckAndSaveAuthCodeUseCase(AuthRepository) }
     private val _uiState = MutableStateFlow<AuthState>(AuthState.Data)
     val uiState: StateFlow<AuthState> = _uiState.asStateFlow()