#include<stdio.h>
int main(){
    float price;
     scanf("%f", &price); // 从用户那里获取价格  
    if(price>=100&&price<500){
        price = price*0.9;
    } else if (price>=500&&price<2000) {
        price = price*0.8;
    }else if (price>=2000&&price<5000) {
        price = price*0.7;
    } else if (price>=5000) {
        price = price*0.6;
    }//这里不需要else分支,100元内价格不变,否则代码冗余
    printf("%.1f",price);
    return 0;
}