// editor3
#include<stdio.h>
int main()
{
    int first;
    int second;
    int total_mass;
    scanf("%d %d %d",&first,&second,&total_mass);
    if(first<0 || second<0)
    {
        printf("Invalid input");
    }
    else
    {
       
        total_mass=first+second;
        printf("%d",total);
    }
    
    return 0;
}