#include<iostream>
using namespace std;

int main()
{
	double x,res;
	cin>>x;
	if(x<=100000)
		res=x*0.1;
	else if(x<=200000)
		res=100000*0.1+(x-100000)*0.075;
	else if(x<=400000)
		res=100000*0.1+100000*0.075+(x-200000)*0.05;
	else if(x<=600000)
		res=100000*0.1+100000*0.075+200000*0.05+(x-400000)*0.03;
	else if(x<=1000000)
		res=100000*0.1+100000*0.075+200000*0.05+200000*0.03+(x-600000)*0.015;
	else
		res=100000*0.1+100000*0.075+200000*0.05+200000*0.03+400000*0.015+(x-1000000)*0.01;
	cout<<res;
	return 0;
}