#include<iostream>
using namespace std;
int main()
{
    int len,wid;
    cin >> len;
    cin >> wid;
    
    try{
        if len<=0 || wid <0){
            throw"Invalid Input";
        }
        int area =len*wid;
        cout << area;
    }
    catch(const char*msg){
        cout<<msg;
    }
    return 0;
}