12405 - 计算个人所得税

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,ns;
	double ans;
	cin>>n;
	ans=n;
	ns=n-3500;
	if(ns<=0) ans-=0;
	else if(ns<=1500) ans-=ns*0.03;
	else if(ns<=4500) ans-=ns*0.1-105;
	else if(ns<=9000) ans-=ns*0.2-555;
	else if(ns<=35000) ans-=ns*0.25-1005;
	else if(ns<=55000) ans-=ns*0.3-2755;
	else if(ns<=80000) ans-=ns*0.35-5505;
	else  ans-=ns*0.45-13505;
	printf("%.2lf",ans);
	return 0;
}