我的代码：

#include <iostream>
#include <cstdio>
using namespace std;

int main()
{
    int n;
    double s = 0;
    cin >> n;
    if (n <= 150)
    {
        s += n * 0.4463;
    }
    else if (n >= 151 && n <= 400)
    {
        s += 150 * 0.4463;
        s += (n - 150) * 0.4663;
    }
    else
    {
        s += 150 * 0.4463;
        s += (400 - 150)  * 0.4663;
        s += (n - 400) * 0.5663;
    }
    printf("%2.lf", s);
    return 0;
}