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

if x < y:
    a = x*1000
    b = y*1000
    c = h
else:
    a = y*1000
    b = x*1000
    c = h

ans = 0

while a > h:
    a /= 2
    h *= 2
    ans += 1

while b > h:
    b /= 2
    h *= 2
    ans += 1

print(ans)