#include<stdio.h>
int main(){
	int a=0;
	scanf("%d",&a);
	//printf("%d\n",a);
	//printf("%g\n",a<100000?a*0.1:0);
	if(a<=100000)
		printf("%g\n",a*0.1);
	else if(a<=200000)
		printf("%g",100000*0.1+(a-100000)*0.075);
	else if(a<=400000)
		printf("%g",100000*0.1+100000*0.075+(a-200000)*0.05);
	else if(a<=600000)
		printf("%g",100000*0.1+100000*0.075+200000*0.05+(a-400000)*0.03);
	else if(a<=1000000)
		printf("%g",100000*0.1+100000*0.075+200000*0.05+200000*0.03+(a-600000)*0.015);
	else 
		printf("%g",100000*0.1+100000*0.075+200000*0.05+200000*0.03+400000*0.015+(a-1000000)*0.01);
	return 0;
}