#include<iostream>
using namespace std;

int calculateArea(int 1, int w)
{
    if(1 <= 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;
}