#include<iostream>
#include<iomanip>
#include<string>
using namespace std;
int main(){
    string loanType;
    double amount;
    int years;
    cin >> loanType;
    cin >> amount;
    cin>> years;
    
    double rate = 0.0;
    
    if(loanType =="home"){
        rate = 0.05;
    }
    else if(loanType =="personal"){
        rate =0.10;
    }
    else{
        cout <<"Invalid loan type";
        return 0;
    }
double interest = amount*rate*years;
cout<<fixed<<setprecision(2)<<intrest;
return 0;
}