#include<stdio.h>
int main()
{
    int quantity;
    scanf("%d", &quantity);
    if(quatity < 0){
        printf("Invalid input");
        return 0;
    }
    float price = 100.0;
    float total = quatity * price;
    float discount = 0.0;
    if(quatity >= 1 && quatity <= 5){
        discount = 0.10;
    }
    else if(quatity >= 6 && quatity <= 10){
        discount = 0.15;
    }
    else if(quatity > 10){
        discount = 0.20;
    }
    float finalAmount = total - (total * discount);
    printf("%2f", finalAmount);
    return 0;
}