#include <stdio.h>

int main() 
{
    int a,b;
    int sum[20060617];
    int count = 0;
    while(count >= 0)
    {
        scanf("%d %d",&a,&b);
        sum[count] = a + b;
        count++;
        if(a == 0 && b == 0)
        {
            break;
        }
    }
    for(int i = 0;i <= count - 2;i++)
    {
        printf("%d\n",sum[i]);
    }

    return 0;
}