import java.util.Scanner;
public class Test1004{
    public static void main (String args[]) {
        int n,a,b,i,sum;
        Scanner in=new Scanner(System.in);
        n=in.nextInt();/*输入整数n*/
        for (i=1;i<=n;i++){
            a=in.nextInt();/*输入a的值*/
            b=in.nextInt();/*输入b的值*/
            sum=a+b;
            System.out.println("sum="+sum);
        }
    }
}