import sys

x,y,h = map(int, sys.stdin.readline().strip().split())

count = 0

x = x * 100 * 10
y = y * 100 * 10

def do(n, h, count):
    n = int(n / 2)
    h = h * 2
    count += 1
    return (n, h, count)


while True:
    if y >= x:
        if x >= 2 and x > h:
            x, h, count = do(x, h, count)
        elif y >= 2 and y > h:
            y, h, count = do(y, h, count)
        else:
            break
    elif x >= y:
        if y >= 2 and y > h:
            y, h, count = do(y, h, count)
        elif x >= 2 and x > h:
            x, h, count = do(x, h, count)
        else:
            break

print(count)