#include<stdio.h>
void main()
{
double i,s;
scanf("%lf",&i);
if (i<=1e+5) s=0.1*i;
else if(i>=1e+5&&i<=2e+5) s=((1e+5)*0.1)+(i-(1e+5))*0.075;
else if(i>=2e+5&&i<=4e+5) s=((1e+5)*0.1)+((1e+5)*0.075)+(i-(2e+5))*0.05;
else if(i>=4e+5&&i<=6e+5) s=((1e+5)*0.1)+((1e+5)*0.075)+((2e+5)*0.05)+(i-(4e+5))*0.03;
else if(i>=6e+5&&i<=1e+6) s=((1e+5)*0.1)+((1e+5)*0.075)+((2e+5)*0.05)+((2e+5)*0.03)+(i-(6e+5))*0.015;
else(i>=1e+6) s=((1e+5)*0.1+((1e+5)*0.075)+((2e+5)*0.05)+((2e+5)*0.03)+((4e+5)*0.015)+(i-(1e+6))*0.01;
printf("%lf\n",s);
}