import sys

sys.setrecursionlimit(10 ** 8)

input = sys.stdin.readline


def main():
    X, Y, H = [int(x) for x in input().split()]

    X *= 1000
    Y *= 1000

    ans = 0
    while 1:
        if X < H > Y:
            break
        if X > H:
            X //= 2
            ans += 1
            H *= 2
            continue
        if Y > H:
            Y //= 2
            ans += 1
            H *= 2
            continue

    print(ans)




if __name__ == '__main__':
    main()