def calc(x):
	dp = [[[[0 for l in range(2)] for k in range(2)] for j in range(15)] for i in range(30)]
	s = str(x)
	v = [int(c) for c in s]
	dp[0][0][0][0] = 1
	for i in range(len(v)):
		for md15 in range(15):
			for notZero in range(2):
				for les in range(2):
					val = dp[i][md15][notZero][les]
					if val==0:
						continue
					for d in [3, 5]:
						nmd15 = (md15*10+d)%15
						if les==0 and d > v[i]:
							continue
						nles = les
						if d < v[i]:
							nles = 1
						dp[i+1][nmd15][1][nles] += val
					if notZero==0:
						dp[i+1][0][0][1] += val
	return dp[len(v)][0][1][0]+dp[len(v)][0][1][1]

N = int(input())

# (l, r]
l, r, m = 0, 5533533555333355355553555, 0
while r-l>1:
	m = (l+r)//2
	y = calc(m)
	if y>=N:
		r = m
	else:
		l = m
print(r)