#!/usr/bin/ python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

x, y, h = map(int, read().split())
x *= 10 ** 3
y *= 10 ** 3

answer = 0
while True:
    if x > h:
        h *= 4
        y *= 2
    elif y > h:
        h *= 4
        x *= 2
    else:
        break
    answer += 1
print(answer)