#include <stdio.h>

int main() {
	float input,money,result;
	scanf("%f",&input);
	money = input * 10000;
	
	if(input <= 10) result = money * 0.1;
	else if(input <= 20) result = 100000 * 0.1 + (money - 100000) * 0.075;
	else if(input <= 40) result = 100000 * 0.1 + 100000 * 0.075 + (money - 200000) * 0.05;
	else if(input <= 60) result = 100000 * 0.1 + 100000 * 0.075 + 200000 * 0.05 + (money - 400000) * 0.03;
	else if(input <= 100) result = 100000 * 0.1 + 100000 * 0.075 + 200000 * 0.05 + 200000 * 0.03 + (money - 600000) * 0.015;
	else result = 100000 * 0.1 + 100000 * 0.075 + 200000 * 0.05 + 200000 * 0.03 + 400000 * 0.015 + (money - 1000000) * 0.01;
	
	result /= 10000;
	printf("*%.2f",result);
	
	return 0;
}