import sys

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

x *= 1000
y *= 1000

p = 0
tmp = h
while tmp < x:
    tmp *= 4
    p += 1

# print(p, file=sys.stderr)

mx = 0
for i in range(p + 1):
    x_i = x
    y_i = y * pow(2, i)
    h_i = h * pow(4, i)
    count = i
    while h_i < y_i:
        h_i *= 4
        x_i *= 2
        count += 1

    if mx < count:
        mx = count

print(mx)