肥肠简单。

#include<bits/stdc++.h>
using namespace std;

int main(){
	int n;
	double sum;
	cin>>n;
	if(n>400){
		sum=66.945+116.575+(n-400)*0.5663;
	}else if(n>150){
		sum=66.945+(n-150)*0.4663;
	}else{
		sum=n*0.4463;
	}
	cout<<fixed<<setprecision(1)<<sum;
	return 0;
}