#include <stdio.h>

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