T = int(input())
p = [1 / 12, 1 / 6, 1 / 4, 1 / 12, 1 / 4, 1 / 6]
for _ in range(T):
    N = int(input())
    E = [0] * (N + 1)
    E[N] = 0
    for i in range(N - 1, -1, -1):
        tmp = 0
        for j in range(1, 7):
            tmp += E[min(i + j, N)] * p[j - 1]
        E[i] = 1 + tmp
    print(E[0])