#include<stdio.h>
int main ()
{
    float weight;
    scanf("%f",&weight);
    scanf("%d",&reactant2);
    if(reactant1>0&&reactant2>0)
    {
        mass=reactant1,reactant2;
        printf("%d",mass);
    }
    else
    {
         printf("Invalid input");
    }
    return 0;
}