第2和第5个点没过？

求大佬讲解

#include<bits/stdc++.h>
using namespace std;
double k(int a)
{
	if ( a <= 150 ) return a * 0.4463;
	else if ( a <= 400) return 150 * 0.4463 + ( a - 150 )  * 0.4663;
	else return 249 * 0.4663 + 150 * 0.4463 + ( a - 499 )  * 0.5663;
}
int main()
{
	//with good luck
	int n = 0 ;
	cin >> n ;
	printf("%.1lf" , k ( n ));
	
	return 0;
}