Добавьте файлы проекта.

Examen31P_LebedevaAF.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.2.32526.322
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Examen31P_LebedevaAF", "Examen31P_LebedevaAF\Examen31P_LebedevaAF.csproj", "{A97F3C4B-CCA7-46D1-A1D8-84709CC25FFA}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A97F3C4B-CCA7-46D1-A1D8-84709CC25FFA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A97F3C4B-CCA7-46D1-A1D8-84709CC25FFA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A97F3C4B-CCA7-46D1-A1D8-84709CC25FFA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A97F3C4B-CCA7-46D1-A1D8-84709CC25FFA}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {761FFD07-BFA2-454B-A3C1-558D2B5BB2C6}
+	EndGlobalSection
+EndGlobal

Examen31P_LebedevaAF/Examen31P_LebedevaAF.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Examen31P_LebedevaAF/Program.cs

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+using System;
+
+