n = int(input())

if n == 0:
    print(0)
    exit()

Q = []
R = []
curr = 10
nc = n
while nc > 0:
    q, r = divmod(curr, 7)
    if R and R[0] == r:
        break
    Q.append(q)
    R.append(r)
    curr = r * 10
    nc -= 1
if nc == 0:
    print("0." + ''.join(map(str, Q)))
else:
    loop = len(Q)
    q, r = divmod(n, loop)
    print("0." + ''.join(map(str, Q)) * q + ''.join(map(str, Q[:r])))