# import module
import sys
import math
import numpy as np

x , y , h = map(int,input().split())

x *= 1000
y *= 1000

def tt(z,h,times):
    while z > h :
        z = z/2
        h = h*2
        times = times+1
    return times

def solve(x,y,h):
    n = tt(min(x,y),h,0)
    h = h * (2**n)
    print(tt(max(x,y),h,n))

if __name__ == "__main__":
    solve(x,y,h)