#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int N = 205;
double f[N];
double cal(int x) {
    if(x >= 95) return 4.3;
    if(x >= 90) return 4.0;
    if(x >= 85) return 3.7;
    if(x >= 80) return 3.3;
    if(x >= 75) return 3.0;
    if(x >= 70) return 2.7;
    if(x >= 67) return 2.3;
    if(x >= 65) return 2.0;
    if(x >= 62) return 1.7;
    if(x >= 60) return 1.0;
    return 0;
}
int main() {
    int T, x;
    for(int i = 0; i <= 100; i++) {
        for(int j = 0; j <= 100; j++) {
            f[i + j] = max(f[i + j], cal(i) + cal(j));
        }
    }
    scanf("%d", &T);
    double ans = 0;
    while(T--) {
        scanf("%d", &x);
        for(int i = 0; i <= min(200, x); i++) {
            ans = max(ans, f[i] + f[x - i]);
        }
        printf("%.1f\n", ans);
    }
    return 0;
}