import sys
from collections import defaultdict


def input(): return sys.stdin.readline().rstrip('\n')

def solve(x,y,h):
    c = 0
    while x > h:
        y *= 2
        h *= 4
        c += 1
    while y > h:
        x *= 2
        h *= 4
        c += 1
    return c

def main():
    x,y,h=map(int,input().split())
    x, y = x*1000, y*1000
    return max(solve(x,y,h), solve(y,x,h))


if __name__ == '__main__':
    ret = main()
    if ret is not None:
        print(ret)