import itertools
from math import factorial

comb = lambda n, k: factorial(n) // (factorial(k) * factorial(n - k))

N = int(input())

ct, cur = 0, 0
i = 3
while ct + cur < N:
    ct += cur
    cur = 0
    for fives_num in range(3, i + 1, 3):
        cur += comb(i - 1, fives_num - 1)
    i += 1

i -= 1
lst = []
for fives_num in range(3, i + 1, 3):
    for t in itertools.combinations(range(i - 1), fives_num - 1):
        x = int(''.join(map(str, ['5' if j in t else '3' for j in range(i - 1)])) + '5')
        lst.append(x)
lst.sort()
print(lst[N - ct - 1])