#include<iostream>
using namespace std;

int calculateArea(int 1, int w) {
    if (l <= 0 || w <= 0) {
        throw "Invalid input";
    }
    return 1 * w;
}
int main() {
    int l,w;
    cin >> l >> w;
    
    try {
        int area = calculateArea(l, w);
        cout<< area << endl;
    }
    catch (const char*msg) {
        cout << msg << endl;
    }
    
    return 0;
}