#include <stdio.h>

int main() 
    int x,y;
    int *p1, p2, sum;
    
    scanf("%d", &x);
    scanf("%d", &y);
    
    if(x < 0 || y < 0) {
        printf("Invalid input");
        return 0;
    }
    p1 = &x;
    p2 = &y;
    
    sum = *p1 + *p2;
    
    printf("%d", sum);
    return 0;
    
    }