#include<stdio.h>
int main()
{
    int first reactant,second reactant,total mass;
    scanf("%d",&first reactant);
    scanf("%d",second reactant);
    if(first reactant<=0||second reactant<=0)
    {
        printf("Invalid input");
    }
    else
    {
        total mass=first reactant+second reactant;
        printf("total mass of product=%d\n,total_mass");
    }
    return 0;
    
}