import sys
from collections import defaultdict


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


def main():
    x,y,h=map(int,input().split())
    x *= 1000
    y *= 1000
    c = 0
    while max(x, y)>h:
        if x <= h < y or h < y <= x:
            y //= 2
        else:
            x //= 2
        h *= 2
        c += 1
    return c


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