#include<stdio.h>
int main()
{
    int r1,r2,total mass;
    if (scanf("%d",&r1) !=1 || scanf("%d",&r2) !=1)
    {
    printf("Invalid input");
    }
    if (r1<0 || r2<0)
    {
        printf("Invalid input");
    } 
    total mass=r1+r2;
    printf("%d",total mass);
    return 0;
}