x,y,h = map(int,input().split())
x *= 1000
y *= 1000

res = 0

tmp = 0
a,b,c = x,y,h
while a > (c << tmp):
    c <<= 1
    tmp += 1
while b > c:
    c <<= 2
    tmp += 1
res = max(res, tmp)

tmp = 0
a,b,c = x,y,h
while b > (c << tmp):
    c <<= 1
    tmp += 1
while a > c:
    c <<= 2
    tmp += 1
res = max(res, tmp)

print(res)