// editor1
#include <iostream>
#include<iomanip>
#include<string>
using namespace std;
class qty{
    public:
    string name;
    float quan,price;
    float res=0;
    void qtyy(string name,float quan, float price){
        if (quan<=0 || price<=0){
        cout<<"Invalid input";
    }
    else{
        res=quan*price;
        cout<<fixed<<setprecision(2)<<res;
        }
        
    }
};
int main(){
    string name;
    float quan, price;
    cin>>name;
    cin>>quan;
    cin>>price;
    qty q;
    q.qtyy(name,quan,price)
    return 0;
}