using System;
public class Program
{
public static void Main()
// + - * / % ++ --
int a=10;
int b=5;
int c=2;
int d=20;
Console.WriteLine(a+b);
Console.WriteLine(d-c);
Console.WriteLine(b*c);
Console.WriteLine(a/b);
Console.WriteLine(b%c);
Console.WriteLine(d%c);
d++;
Console.WriteLine(d);
b--;
Console.WriteLine(b);
a+=5;
Console.WriteLine(a);
c-=3;
Console.WriteLine(c);
}