#include<stdio.h>
int main(){
    int quantity;
    scanf("%d",&quantity);
    if(quantity<0){
        printf("Invalid input");
        return 0;
    }
    float  cost_per_book=100;
    float total=quantity*cost_per_book;
    float discount=0.0;
    
    if (quantity>=1 && quantity<=5){
        dicount=0.10;
    }
    else if(quantity>=6 && quantity<=100){
        discount =0.15;
    }
    else if(quantity >10){
        discount =0.20;
    }
    total=total-(total*discount);
    printf("%.2f",total);
    return 0;
}