文件目录

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    double a;
    cin >> a;
    if (a <= 20)
        cout << fixed << setprecision(2) << a * 1.68;
    else
        cout << fixed << setprecision(2) << a * 1.98;
    return 0;
}