package java4;
import java.util.Scanner;
public class JiaoShui {
	public static void main(String[] args) {
	                   //㹤˰
		Scanner input = new Scanner(System.in);  
		    System.out.print("빤ʽ:");
		int gongZi = input.nextInt();
		if(gongZi<=3500){
			System.out.print("ý˰");}
		else if(gongZi<=8000){
			System.out.print("˰:"+(gongZi-3500)*0.02);
		}
		else if(gongZi<=20000){
			System.out.print("˰:"+(gongZi-3500)*0.05);
		}
		else{
			System.out.print("˰:"+(gongZi-3500)*0.1);
		}
		
		
		
		
	}

}