x = int(input())
# n = 10 ** x #10のx乗

y = '0.'

a = x // 6
b = x % 6

if x == 0:
    ans = 0
elif b == 0:
    ans = y + '142857'*a
elif b == 1:
    ans = y +  '142857'*a + '1'
elif b == 2:
    ans = y +  '142857'*a + '14'
elif b == 3:
    ans = y +  '142857'*a + '142'
elif b == 4:
    ans = y +  '142857'*a + '1428'
elif b == 5:
    ans = y +  '142857'*a + '14285'


print(ans)