using System;

public class Program

{

    public static void Main()

    {

        int[ ]  array = {1,3,5,2,6,1};

         a = array[2] + array[3]=5+2=7;

         b = array[0] + array[1]=1+3=4;

         c = array[4 ] + array[5]=6+1=7;

​

​

​

​

    }

}