#include<stdio.h>
int main(){
    int reactant1, reactant2;
    if (scanf("%d %d", &reactant1, &reactant2) != 2) {
        printf("Invalid input");
        return 0;
    }
    if (reactant1 < 0 || reactant2 < 0 || reactant1 > 1000 || reactant2 > 1000) {
        printf("Invalid input");
    }
    else {
        int totalmass = reactant1 + rreactant2;
        printf("%d", totalmass);
    }
    return 0;
}