#include <iostream>
#include <algorithm>
using namespace std;
int main(){
	double profit;
	cin>>profit;
    const double INF=1e9;
	double a[]={0,100000,200000,400000,600000,1000000,INF};
	double radio[]={0.1,0.075,0.05,0.03,0.015,0.01};
	int total;
	//想象一个数轴，左边是0，右边是无穷，共六个区间，从左往右算
	for(int i=0;i<6;i++){
		double low = a[i];//区间的左端
		double high = a[i+1];//区间的右端
        if(profit>low){
          double thisPart = min(profit, high) - low; //这段区间的利润
		  total += thisPart * radio[i];//这段区间利润的提成
        }else break;//总利润并未达到该区间
    }
    cout<<total;
	return 0;
}