欢乐赛#51 T2

#include <bits/stdc++.h>
using namespace std;
int main(){
    double x;
    cin>>x;
    if (x<=100) x*=0.8;
    else if (x<=300) x*=0.9;
    else if (x>500) x*=1.5;
    printf("%.1lf",x);
    return 0;
}