using System;

public class Program

{

    public static void Main()

    {

    int a = 15,  b = 7;

for (int i=2; i<=6; i++) {

if (i%3==0) continue;

a += 2;

b -= 2;

​

    Console.WriteLine("a= " + a);

Console.WriteLine("b= " + b);

}

​

    }

}