import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	A = int(input())
	if A == 5:
		print(5)
		return
	ans = INF
	n = 1
	cnt = 0
	while True:
		n *= 2
		cnt += 1
		if n >= A:
			break

	ans = min(ans, cnt * 2)

	n = 1
	cnt = 0
	while True:
		n *= 3
		cnt += 1
		if n >= A:
			break

	ans = min(ans, cnt * 3)
	print(ans)

if __name__ == '__main__':
	main()