#include<iostream>
using namespace std;
int calculateArea(int l;int w)
{
    if(l<=0 || w<=0)
    {
        throw "Invalid input";
    }
    return 1 * w;
}
int main()
{
    int length,width;
    cin>>length;
    cin>>width;
    
    try
    {
        int area=calculateArea(length,width);
        cout<<area;
    }
    catch(const char* msg)
    {
        cout<<msg;
    }
    return 0;
}