diff --git a/src/main/kotlin/data/UserRepository.kt b/src/main/kotlin/data/UserRepository.kt
index 9878def..dc250ff 100644
--- a/src/main/kotlin/data/UserRepository.kt
+++ b/src/main/kotlin/data/UserRepository.kt
@@ -1,9 +1,10 @@
 package org.example.data
 
 import org.example.data.model.UserDTO
+import org.example.domain.request.RegistrationRequest
 
 interface UserRepository {
-    fun addUser()
+    fun addUser(registrationRequest: RegistrationRequest): UserDTO
     fun removeUserById(userId: Int): Boolean
     fun updateUserById(userId: Int, updatedUser: UserDTO): UserDTO
     fun getAllUsers(): List<UserDTO>
diff --git a/src/main/kotlin/data/UserRepositoryImpl.kt b/src/main/kotlin/data/UserRepositoryImpl.kt
index e7a3c42..ae9fc56 100644
--- a/src/main/kotlin/data/UserRepositoryImpl.kt
+++ b/src/main/kotlin/data/UserRepositoryImpl.kt
@@ -1,12 +1,21 @@
 package org.example.data
 
 import org.example.data.model.UserDTO
+import org.example.domain.request.RegistrationRequest
 
 class UserRepositoryImpl: UserRepository {
     private val userSource: MutableList<UserDTO> = userList.toMutableList()
 
-    override fun addUser() {
-        TODO("Not yet implemented")
+
+    override fun addUser(registrationRequest: RegistrationRequest): UserDTO {
+        val newUser = UserDTO(
+            userId = userSource.size + 1,
+            email = registrationRequest.email,
+            firstName = registrationRequest.firstName,
+            password = registrationRequest.password
+        )
+        userSource.add(newUser)
+        return newUser
     }
 
     override fun removeUserById(userId: Int): Boolean {
diff --git a/src/main/kotlin/domain/UserUseCase.kt b/src/main/kotlin/domain/UserUseCase.kt
index c4a9c75..504fb54 100644
--- a/src/main/kotlin/domain/UserUseCase.kt
+++ b/src/main/kotlin/domain/UserUseCase.kt
@@ -1,11 +1,12 @@
 package org.example.domain
 
 import org.example.domain.request.AuthorizeRequest
+import org.example.domain.request.RegistrationRequest
 import org.example.domain.response.UserResponse
 
 interface UserUseCase {
     fun authorize(authorizeRequest: AuthorizeRequest): UserResponse
-    fun registration()
+    fun registration(registrationRequest: RegistrationRequest): UserResponse
     fun changePassword()
     fun changeProfile()
 }
\ No newline at end of file
diff --git a/src/main/kotlin/domain/UserUseCaseImpl.kt b/src/main/kotlin/domain/UserUseCaseImpl.kt
index b5996f0..98ab4ac 100644
--- a/src/main/kotlin/domain/UserUseCaseImpl.kt
+++ b/src/main/kotlin/domain/UserUseCaseImpl.kt
@@ -2,6 +2,7 @@ package org.example.domain
 
 import org.example.data.UserRepository
 import org.example.domain.request.AuthorizeRequest
+import org.example.domain.request.RegistrationRequest
 import org.example.domain.response.UserResponse
 
 class UserUseCaseImpl(private val userRepository: UserRepository): UserUseCase {
@@ -19,10 +20,19 @@ class UserUseCaseImpl(private val userRepository: UserRepository): UserUseCase {
         return UserDtoToUserResponse(findUser)
     }
 
-    override fun registration() {
-        TODO("Not yet implemented")
+    override fun registration(registrationRequest: RegistrationRequest): UserResponse {
+        //уникальность почты
+        val isUnique = userRepository.getAllUsers().firstOrNull{
+            it.email == registrationRequest.email
+        } == null
+        require(isUnique){
+            "Такая почта уже существует"
+        }
+        userRepository.addUser()
     }
 
+
+
     override fun changePassword() {
         TODO("Not yet implemented")
     }
diff --git a/src/main/kotlin/domain/request/RegistrationRequest.kt b/src/main/kotlin/domain/request/RegistrationRequest.kt
new file mode 100644
index 0000000..0d5d133
--- /dev/null
+++ b/src/main/kotlin/domain/request/RegistrationRequest.kt
@@ -0,0 +1,7 @@
+package org.example.domain.request
+
+data class RegistrationRequest (
+    val email: String,
+    val password: String,
+    val firstName: String
+)
\ No newline at end of file
diff --git a/src/main/kotlin/ui/UserUI.kt b/src/main/kotlin/ui/UserUI.kt
index eedc072..514f876 100644
--- a/src/main/kotlin/ui/UserUI.kt
+++ b/src/main/kotlin/ui/UserUI.kt
@@ -6,10 +6,12 @@ import org.example.domain.response.UserResponse
 
 class UserUI(private val userUseCase: UserUseCase) {
     fun authorize(){
+        println("Введите почту")
         val email = readlnOrNull()
         checkNotNull(email){
             "Почта не должна отсутствовать"
         }
+        println("Введите пароль")
         val password = readlnOrNull()
         checkNotNull(password){
             "Пароль не должен отсутствовать"
@@ -18,10 +20,10 @@ class UserUI(private val userUseCase: UserUseCase) {
             email = email,
             password = password,)
         val user = userUseCase.authorize(authorizeRequest)
-        println(UserResponseToString(user))
+        println(userResponseToString(user))
     }
 
-    fun UserResponseToString(userResponse: UserResponse): String{
+    private fun userResponseToString(userResponse: UserResponse): String{
         val printOutput = StringBuilder()
         printOutput.append("Ваша почта ${userResponse.email}")
         printOutput.appendLine()