#include<iostream>
using namespace std;

int calulateArea(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;
}