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

样例都过了