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