#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
    string fule;
    float quantity,price;
    cin>>fule;
    cin>>quantity;
    cin>>price;
    if(quantity< 0 || price< 0)
    {
        cout<<"Invalid input";
        return 0;
    }
    cost=price * quantity;
    cout<<fixed<<setprecision(2)<<cost<<endl;
    return 0;
}