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

x, y = sorted([x,y])

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