diff --git a/lab 5/NumberOperations/NumberOperations.fsproj b/lab 5/NumberOperations/NumberOperations.fsproj
new file mode 100755
index 0000000..299cf40
--- /dev/null
+++ b/lab 5/NumberOperations/NumberOperations.fsproj	
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="Program.fs" />
+  </ItemGroup>
+
+</Project>
diff --git a/lab 5/NumberOperations/Program.fs b/lab 5/NumberOperations/Program.fs
new file mode 100755
index 0000000..5a32dfd
--- /dev/null
+++ b/lab 5/NumberOperations/Program.fs	
@@ -0,0 +1,16 @@
+// For more information see https://aka.ms/fsharp-console-apps
+printfn "Hello from F#"
+
+let rec sumDigits n =
+    if n < 10 then n
+    else (n % 10) + sumDigits (n / 10)
+
+[<EntryPoint>]
+let main argv =
+    System.Console.WriteLine("Введите число:")
+    let number = System.Console.ReadLine() |> int
+    
+    let result = sumDigits number
+    System.Console.WriteLine($"Сумма цифр числа {number} равна {result}")
+    
+    0