#include<stdio.h>
using namespace std;
//ifstream in("adunare.in");
//ofstream out("adunare.out");
int main(void)
{
    FILE * in;
 in = fopen ("adunare.in","r");
  FILE * out;
  out = fopen ("adunare.out","w");
    int a,b,n;
    fscanf(in,"%d%d", &a,&b);
    n=a+b;
    if(n>2000000000)
        fprintf(out,"No");
    else
        fprintf(out,"%d", n);
}