def origami(x, y, h):
    x = x * 1000
    y = y * 1000
    cnt = 0
    while (x > h) or (y > h):
        if x >= y:
            if y > h:
                y = y / 2
            else:
                x = x / 2
        else:
            if x > h:
                x = x / 2
            else:
                y = y / 2
        h = h * 2
        cnt += 1
    return cnt

def main():
    x, y, h = map(int, input().split())
    print(origami(x, y, h))

if __name__ == '__main__':
    main()