#include<bits/stdc++.h> using namespace std; int main(){ int n; cin>>n; if(int(n<10000)) cout<<"0"; else if(int(n>=10000||n<=29999)) cout<<n*0.03; else if(int(n>=30000||n<=49999)) cout<<n*0.07; else if(int(n>=50000)) cout<<(n-1000)*0.13; return 0; }