T2

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