#include <iostream>
#include <iomanip>
using namespace std;
int main(){
    int a;
    if(a <= 150){
        cout << fixed << setprecision(1) << a * 0.4463;
    }else if(a >= 151 && a <= 400){
        cout << fixed << setprecision(1) << (a - 150) * 0.4663 + 66.945;
    }else{
        cout << fixed << setprecision(1) << (a - 400) * 0.5663 + 186.52;
    }
    return 0;
}