👎

#include <bits/stdc++.h>
#include <cstdio>
using namespace std;
int n;
double a,b,c;
int main()
{
    cin>>n;
    if(n<150)
    {
    	a=n*0.4463;
    	printf("%.1f",a);
    }
    else if(n<400)
    {
        b=150*0.4463+(n-150)*0.4663;
        printf("%.1f",b);
	}
	else
    {
        	c=150*0.4463+250*0.4663+(n-400)*0.5663;
            printf("%.1f",c);
    }
	return 0;
}

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