#include <iostream>
using namespace std;
int calculateArea(int l, int w);
     if (l <= 0 || w <= 0) {
     throw "Invalid input";
    }
      return  l = 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;
}