#include<stdio.h>
int main()
{
    int reactant1, reactant2;
    scanf("%d %d", &reactant1, &reactant2 <=0){
        printf("Invalid input\n");
    }
    else{
        int total_mass=reactant1+reactant2;
        printf("%d\n", total_mass);
    }
    return 0;
    
}