#include<bits/stdc++.h>
using namespace std;
#define REP(i,st,ed) for(register int i=st,i##end=ed;i<=i##end;++i)
#define DREP(i,st,ed) for(register int i=st,i##end=ed;i>=i##end;--i)
template<typename T>inline bool chkmin(T &x,T y){return (y<x)?(x=y,1):0;}
template<typename T>inline bool chkmax(T &x,T y){return (y>x)?(x=y,1):0;}
typedef long long ll;
inline int read(){
    static int x,f;f=1;
    static char c;
    while((c=getchar())!='-' && (c>'9' || c<'0'));
    if(c=='-') f=-1,c=getchar();
    x=(c^'0');
    while((c=getchar())>='0' && c<='9') x=(x<<1)+(x<<3)+(c^'0');
    return x*f;
}
const int maxn=400+10;
double p[maxn],dp[5][maxn];
int main(){
    int T=read();
    REP(i,60,61) p[i]=1;
    REP(i,62,64) p[i]=1.7;
    REP(i,65,66) p[i]=2;
    REP(i,67,69) p[i]=2.3;
    REP(i,70,74) p[i]=2.7;
    REP(i,75,79) p[i]=3.0;
    REP(i,80,84) p[i]=3.3;
    REP(i,85,89) p[i]=3.7;
    REP(i,90,94) p[i]=4;
    REP(i,95,100) p[i]=4.3;
    REP(i,1,4) REP(j,1,400) REP(k,0,min((int)j,100)) chkmax(dp[i][j],dp[i-1][j-k]+p[k]);
    while(T--){
        int x=read();
        printf("%.1lf\n",dp[4][x]);
    }
    return 0;
}