import sys
input = sys.stdin.readline

def linput():
	return list(map(float,input().split()))

def gcd(a: int, b: int):
	while b: a, b = b, a%b
	return a

def lcm(a: int, b: int):
	return a * b // gcd(a, b)

def main():
	X,Y,H = linput()
	X,Y = X*1000, Y*1000
	
	res = 0
	cnt = 0
	while X>H or Y>H:
		X,Y = sorted([X,Y])
		if X>H:	X /= 2
		elif Y>H: Y /= 2
		else: break
		H *= 2
		res += 1
		cnt += 1
		#print(res,cnt,X,Y,H)
		if cnt>9999: break
	
	print(res)

if __name__ == "__main__":
	main()