import heapq


def next_to(mu, mi, h, d):
    if mu < h:
        t = mu
    elif mi < h:
        t = mi
    else:
        return 1
    return (h - t) // d + 1


def solve():
    d = int(input())

    h1 = int(input())
    h2 = int(input())
    h3 = int(input())

    if d == 0:
        if h1 != h2 and h1 != h3 and h2 != h3:
            print(0)
        else:
            print(-1)
        return

    q = [(0, (h1, h2, h3))]

    while q:
        n, h = heapq.heappop(q)

        zs = h.count(0)
        if zs >= 2:
            continue

        ma = max(h)
        mi = min(h)
        mu = sum(h) - ma - mi
        mic = h.count(mi)

        if h[0] != h[1] and h[0] != h[2] and h[1] != h[2] and h[1] != mu:
            print(n)
            return

        if h[0] != mi or mic != 1:
            m = next_to(mu, mi, h[0], d)
            heapq.heappush(q, (n + m, (max(0, h[0] - d * m), h[1], h[2])))

        if (h[1] != mi or mic != 1) and h[1] != ma:
            m = next_to(mu, mi, h[1], d)
            heapq.heappush(q, (n + m, (h[0], max(0, h[1] - d * m), h[2])))

        if h[2] != mi or mic != 1:
            m = next_to(mu, mi, h[2], d)
            heapq.heappush(q, (n + m, (h[0], h[1], max(0, h[2] - d * m))))

    print(-1)


if __name__ == '__main__':
    solve()