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

int main(){
	int a;
	cin >> a;
	double dianfei = 0;
	if (a > 150){
		dianfei += 150*0.4463;
		if (a >= 401){
			dianfei += (400-150)*0.4463;
			dianfei += (a-400)*0.5663;
		}else{
			dianfei += (a-150)*0.4663;
		}
	}else{
		dianfei = a*0.4463;
	}
	printf("%.1lf", dianfei);
}

哪里有问题?