# 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