#include <iostream>
using namespace std;
int main() {
    int numberOfGuests,costPerGuest;
    cin >>  numberOfGuests 
    cin >> costPerGuest;
    
    if (numberOfGuests <0 )
    {
        cout << "Invalid input";
    }
    else {
        cout <<  numberOfGuests*costPerGuest;
    }
    
    return 0;
}