#include <stdio.h>
int main() {
	int amount = 0;
	printf("請輸入訂單金額:");
	scanf("%d", &amount);
	//
	double discount = 0.0;
	if(amount>0 && amount<=1000){
		discount = 1.0;
	} else if(amount>1000 && amount<=2000){
		discount = 0.95;
	} else if(amount>2000 && amount<=3000){
		discount = 0.9;
	} else if(amount>3000 && amount<=5000){
		discount = 0.85;
	} else { //????
		discount = 0.8;
	}
	//
	amount *= discount; //amount = amount*discount;
	printf("折扣後價格=%d\n", amount);
	return 0;
}