求题解

#include<bits/stdc++.h>
using namespace std;
int n;
int main(){
	while(cin>>n&&n!=0){
		if(n<=4){
			cout<<10<<endl;
			continue;
		}
		double ans=n/8*18;
		n%=8;
		if(n<=4) ans+=n*2.4;
		else ans=ans+10+(n-4)*2;
		int t=ans;
		if(ans-t!=0) printf("%.1lf",ans);
		else cout<<t;
		cout<<endl;
	}
	return 0;
}

布吉岛