#include <stdio.h>
int main() {
int a, b;
int t;
while (scanf("%d %d", &a, &b) != EOF)
{
if (a == 0 && b == 0)
{
break;
}
printf("%d\n", a + b);
}
return 0;
}

#include <stdio.h>
int main() {
int a, b;
int t;
while (scanf("%d %d", &a, &b) != EOF)
{
if (a == 0 && b == 0)
{
break;
}
printf("%d\n", a + b);
}
return 0;
}