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