/***************************************************************
    File name: a.cpp
    Author: huhao
    Create time: Sun 19 Jul 2020 02:02:40 PM CST
***************************************************************/
#include<stdio.h>
#include<string.h>
#include<math.h>
#include<algorithm>
#define fr(i,a,b) for(int i=(a),end_##i=(b);i<=end_##i;i++)
#define fd(i,a,b) for(int i=(a),end_##i=(b);i>=end_##i;i--)
int read()
{
    int r=0,t=1,c=getchar();
    while(c<'0'||c>'9')
    {
        t=c=='-'?-1:1;
        c=getchar();
    }
    while(c>='0'&&c<='9')
    {
        r=r*10+c-48;
        c=getchar();
    }
    return r*t;
}
const int N=1010,inf=123456789;
int n,ans;
double f[N];
#define Max(a,b) a=std::max(a,b)
int main()
{
    n=400;
    fr(t,0,3) fd(i,n,0)
    {
        Max(f[i+95],f[i]+4.3);
        Max(f[i+90],f[i]+4.0);
        Max(f[i+85],f[i]+3.7);
        Max(f[i+80],f[i]+3.3);
        Max(f[i+75],f[i]+3.0);
        Max(f[i+70],f[i]+2.7);
        Max(f[i+67],f[i]+2.3);
        Max(f[i+65],f[i]+2.0);
        Max(f[i+62],f[i]+1.7);
        Max(f[i+60],f[i]+1.0);
    }
    fr(T,1,read()) printf("%.1lf\n",f[read()]);
    return 0;
}