#include<stdio.h>

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