#include <stdio.h>

int main() {
    int a = 1;
    int b = 1;
    while(1)
    {   
        scanf("%d %d",&a,&b);
        if(a!=0 && b!=0){
        printf("%d\n",a+b);
        }
        else{
            break;
        }
        
    }
    return 0;
}