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