#include <stdio.h>
int main(){
	double n,a,b,c,d,e;
	scanf("%lf",&n);
	if(n<=100000){
		printf("%.2lf\n",n*0.1);
	}else if(n>100000&&n<=200000){
		a=(n-100000)*0.075+100000*0.1;
		printf("%.2lf\n",a);
	}else if(n>200000&&n<=400000){
		b=(n-200000)*0.05+100000*0.075+100000*0.1;
		printf("%.2lf\n",b);
	}else if(n>400000&&n<=600000){
		c=(n-400000)*0.03+200000*0.05+100000*0.075+100000*0.1;
		printf("%.2lf\n",c);
	}else if(n>600000&&n<=1000000){
		d=(n-600000)*0.015+200000*0.03+200000*0.05+100000*0.075+100000*0.1;
		printf("%.2lf\n",d);
	}else{
		e=(n-1000000)*0.01+400000*0.015+200000*0.03+200000*0.05+100000*0.075+100000*0.1;
		printf("%.2lf\n",e);
	}
	return 0;
}