mod = 998244353


def main():
    import sys
    input = sys.stdin.readline

    H, W, ah, aw, bh, bw = map(int, input().split())
    ok = H + W + 1
    ng = 0
    mid = (ok + ng) // 2
    while ok - ng > 1:
        flg = 0
        for num_h in range(mid + 1):
            num_w = mid - num_h
            if min(H, ah * num_h) * min(W, aw * num_w) + bh * num_h + bw * num_w >= H*W:
                flg = 1
                break
        if flg:
            ok = mid
        else:
            ng = mid
        mid = (ok + ng) // 2
    print(ok)


if __name__ == '__main__':
    main()