#include <stdio.h>
#include <math.h>
int main()
{
    int m,n,i;
  while ( scanf("%d %d",&m,&n) !=EOF)
    {
            //scanf("%d %d",&m,&n);
      if(m!=0&&n!=0)
        printf("%d\n",m+n);
    }
    return 0;
}