from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    X, Y, H = map(int, input().split())

    x, y, h = X * 1000, Y * 1000, H
    n = 0
    while max(x, y) > h:
        if min(x, y) > h:
            if x < y:
                x /= 2
            else:
                y /= 2
        else:
            if x > y:
                x /= 2
            else:
                y /= 2
        h *= 2
        n += 1
    print(n)


main()