#include<stdio.h>
int main() {
    int first_reactant,second_reactant;
    scanf("%d",&first_reactant);
    scanf("%d",&second_reactant);
    if(first_reactant<0 || second_reactant<0) {
        printf("Invalid input");
        return 0;
    }
     int total_mass=first_reactant + second_reactant;
     printf("%d",total_mass) {
     
     return 0;
}