#include <stdio.h>

int main() 
    int x,y;
    
    if (scanf("%d", &x) != 1|| scanf("%d", &y) != 1) {
        printf("Invalid Input");
        return 0;
    }
    
    if(x < 0 || y < 0) {
        printf("Invalid input");
        return 0;
    }
    
        int *ptr1 = &x; 
        int *ptr2 = &y;
        int sum = *ptr1 + *ptr2;
        
        printf("%d", sum);
    
    return 0;
 }