n = int(input())

q, r = divmod(n - 1, 36)
if r <= 7:
    print('1' + str(r + 2) * (q + 1))
elif r <= 14:
    print('2' + str(r - 5) * (q + 1))
elif r <= 20:
    print('3' + str(r - 11) * (q + 1))
elif r <= 25:
    print('4' + str(r - 16) * (q + 1))
elif r <= 29:
    print('5' + str(r - 20) * (q + 1))
elif r <= 32:
    print('6' + str(r - 23) * (q + 1))
elif r <= 34:
    print('7' + str(r - 25) * (q + 1))
else:
    print('8' + '9' * (q + 1))