#include<bits/stdc++.h>
using namespace std;

int main()
{
	int m, p;
	cin>>m;
	if(m<=10000) p=m*0.1;
	else if (m<=20000)p=10000*0.1+(m-10000)*0.075;
	else if (m<=40000)p=10000*0.1+10000*0.075+(m-20000)*0.05;
	else if (m<=60000)p=10000*0.1+10000*0.075+20000*0.05+(m-40000)*0.03;
	else if (m<=100000)p=10000*0.1+10000*0.075+20000*0.05+20000*0.03+(m-60000)*0.015;
	else  p=10000*0.1+10000*0.075+20000*0.05+20000*0.03+40000*0.015+(m-100000)*0.01;
	cout<<p<<endl;
	return 0;
}