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