#include<stdio.h>
int main()
{
    int reactant1,reactant2,totalmass;
    scanf("%d",&reactant1);
    scanf("%d",&reactant2);
    if (reactant1<=1||reactant2<=1)
    {
        printf("Invalid input");
    }
    else(totalmass=reactant1+reactant2)
    {
        printf("totalmass");
    }
    return 0;
}