PR1 Done

PR1/ConsoleApp1/Calculator.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp1
+{
+    public class Calculator
+    {
+        public double Addiction(double x, double y) => x + y;
+        public double Subtraction(double x, double y) => x - y;
+        public double Multipliction(double x, double y) => x * y;
+        public double Division(double x, double y) => x / y;
+        public long Multipliction(long x, long y) => x * y;
+        public long Addiction(long x, long y) => x + y;
+    }
+}

PR1/ConsoleApp1/PR1.csproj

@@ -43,6 +43,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Calculator.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>