#include<stdio.h>
int main()
{
    int reactant1,eactant2,totalmass;
    scanf("%d",&reactant1);
    scanf("%d",&reactant2);
    if(reactant1<=1||reactant2<=1
    {
        printf("Invalid input");
    }
    else{
        totalmass=reactant1+reactant;
        printf("%d",totalmass);
    }
    return 0;
}