#include<bits/stdc++.h>
using namespace std;

int Tn;

int a[100]={0,60,62,65,67,70,75,80,85,90,95};
double b[100]={0.0,1.0,1.7,2.0,2.3,2.7,3.0,3.3,3.7,4.0,4.3};
double f(double x){
    for(int i=10;i>=0;--i){
        if(x>=a[i])return b[i];
    }
    return 0.0;
}

double g[209];
int main(){
    scanf("%d",&Tn);
    for(int i=0;i<=200;++i){
        for(int a=0;a<=100;++a){
            int b=i-a;
            if(b<0||b>100)continue;
            g[i]=max(g[i],f(a)+f(b));
        }
    }
    while(Tn--){
        int sum;scanf("%d",&sum);
        double ans=0;
        for(int a=0;a<=200;++a){
            int b=sum-a;
            if(b<0||b>200)continue;
            ans=max(ans,g[a]+g[b]);
        }
        printf("%.1f\n",ans);
    }
        
    return 0;
}