#include <stdio.h>

int main(){
    int x,y;
    int *px, *py;
    int sum;
    
    if(scanf("%d", &x) !=1)return 0;
    if(scanf("%d", &y) !=1)return 0;
    
    if(x<0 || y<0){
        printf("Invalid Input";
        return 0;)
    }
    px = &x;
    py = &y;
    
    sum = *px + *py;
    
    printf("%d", sum);
    return 0;
}