#include<stdio.h>
int main()
{
    int first;
    int second;
    int float_mass;
    if(scanf("%d\n%d",&first,&second)!=2)
    {
        printf("Invalid input");
        return 0;
    }
    if(first<0 || second<0)
    {
        printf("Invalid input");
    }
    else
    {
        
        total_mass=first+second;
        printf("%d",total_mass);
    }
    return 0;
}