/*********************************************************************
    Problem:1002
    Author:hydd
    Date:
*********************************************************************/
#include<cstdio>
#include<algorithm>
#define File(x) freopen(x".in","r",stdin);freopen(x".out","w",stdout);
using namespace std;
const int pos[11]={0,60,62,65,67,70,75,80,85,90,95};
const int val[11]={0,10,17,20,23,27,30,33,37,40,43};
int T,x;
int main(){
    scanf("%d",&T);
    while (T--){
        scanf("%d",&x);
        int ans=0;
        for (int i=0;i<=10;i++)
            for (int j=0;j<=10;j++)
                for (int k=0;k<=10;k++)
                    for (int l=0;l<=10;l++)
                        if (x>=pos[i]+pos[j]+pos[k]+pos[l]) ans=max(ans,val[i]+val[j]+val[k]+val[l]);
        printf("%d.%d\n",ans/10,ans%10);
    }
    return 0;
}