#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cmath>
using namespace std;
int main()
{int a;
    double b;
    cin>>a;
    if  (a<=150)
    b=a*0.4463;
    
    else if  (151<=a && a<=400)
    b=a*0.4663-a*0.02+5;
    

    else
    b=a*0.5663-43;
    cout<<floor(b*10+0.5)/10.0<<endl;
   return 0;

}
    

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