#include<iostream>
using namespace std;
int main()
{
    int a,c;
    cin>>a>>c;
         
        if(a<0)
        {
             cout<<a*c;
        
        }
    else if(a.length()==0)
    {
    
     
    }
    else
    {
        cout<<"Invalid input";
    }
   
    
    return 0;
}