#include<bits/stdc++.h>
using namespace std;
int c(int x){
    if(x<=59) return 0;
    else if(x<=61) return 10;
    else if(x<=64) return 17;
    else if(x<=66) return 20;
    else if(x<=69) return 23;
    else if(x<=74) return 27;
    else if(x<=79) return 30;
    else if(x<=84) return 33;
    else if(x<=89) return 37;
    else if(x<=94) return 40;
    else return 43;
}
int main(){
    // cout<<setprecision(1)<<fixed;
    int t;cin>>t;
    while(t--){
        int x;cin>>x;
        int ans=0;
        for(int i=0;i<=100;i+=(i==0?60:1)){
            for(int i2=0;i2<=100;i2+=(i2==0?60:1)){
                for(int i3=0;i3<=100;i3+=(i3==0?60:1)){
                    int i4=x-i-i2-i3;
                    if(i4<0||i4>100)continue;
                    ans=max(ans,c(i)+c(i2)+c(i3)+c(i4));
                }
            }
        }
        cout<<ans/10<<"."<<ans%10<<endl;
    }
}