#include <iostream>
using namespace std;

    int calculateArea(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;
}