#include<stdio.h>
int main()
{
    int firstreactant,secondreactant,totalmass;
    scanf("%d",&firstreactant);
    scanf("%d",secondreactant);
    if(firstreactant<=0||secondreactant<=0)
    {
        printf("Invalid input";)
    }
    else
    {
        totalmass=firstreactantsecondreactant;
        printf("%d\n",totalmass);
    }
    return 0;
    
}