#include<bits/stdc++.h>
using namespace std;
#define IOS ios::sync_with_stdio(false);
typedef long long ll;
typedef pair<int,int> p;
const int MAXN=2e5+5;
const int INF=0x3f3f3f3f;
map<int,double> mp;
void init()
{
    mp[95]=4.3;
    mp[90]=4.0;
    mp[85]=3.7;
    mp[80]=3.3;
    mp[75]=3.0;
    mp[70]=2.7;
    mp[67]=2.3;
    mp[65]=2.0;
    mp[62]=1.7;
    mp[60]=1.0;
    mp[0]=0.0;
}
int main()
{
    IOS
    init();
    int T;
    scanf("%d",&T);
    while(T--)
    {
        int num;
        scanf("%d",&num);
        double ans=-1;
        for(map<int,double>::reverse_iterator it1=mp.rbegin();it1!=mp.rend();it1++)
            for(map<int,double>::reverse_iterator it2=mp.rbegin();it2!=mp.rend();it2++)
                for(map<int,double>::reverse_iterator it3=mp.rbegin();it3!=mp.rend();it3++)
                    for(map<int,double>::reverse_iterator it4=mp.rbegin();it4!=mp.rend();it4++)
                        if(it1->first+it2->first+it3->first+it4->first<=num)
                            ans=max(ans,it1->second+it2->second+it3->second+it4->second);
        printf("%.1lf\n",ans);
            
    }
    return 0;
}