using System;
using System.Linq;
using System.Collections.Generic;
using System.Text;

public class Program
{
    public void Proc() {
        Reader.IsDebug = false;
        int[] inpt = Reader.ReadLine().Split(' ').Select(a=>int.Parse(a)).ToArray();
        this.Length = inpt[0];
        if(inpt[1] == 0) {
            long ans = 1;
            for(int i=2; i<=this.Length; i++) {
                ans*=i;
                ans = ans % MOD;
            }
            Console.WriteLine(ans);
        } else {
            this.NumList = Reader.ReadLine().Split(' ').Select(a=>ulong.Parse(a)).OrderBy(a=>a).ToArray();
            long ans = this.GetAns(0,0);
            Console.WriteLine(ans);
        }
    }

    private Dictionary<ulong, long> dic = new Dictionary<ulong, long>();

    private long GetAns(ulong selected, ulong flags) {
        if(dic.ContainsKey(selected)) {
            return dic[selected];
        }

        ulong flags2 = flags;
        for(int i=0; i<this.NumList.Length; i++) {
            ulong key = (ulong)1<<i;
            if((flags2&key) == key) {
                continue;
            }
            if(selected == this.NumList[i]) {
                flags2+=key;
                continue;
            }
            if(selected > this.NumList[i]) {
                dic[selected] = 0;
                return 0;
            }
            ulong selectedR = ~selected;
            ulong numR = ~this.NumList[i];
            if((selectedR&numR) != numR) {
                dic[selected] = 0;
                return 0;
            }
        }
        if(selected == ((ulong)1<<this.Length)-1) {
            if(flags2 == ((ulong)1<<this.NumList.Length)-1) {
                dic[selected] = 1;
            } else {
                dic[selected] = 0;
            }
            return dic[selected];
        }
        if(flags2 == ((ulong)1<<this.NumList.Length)-1) {
            int cnt = 0;
            for(int i=0; i<this.Length; i++) {
                ulong key = (ulong)1<<i;
                if((selected&key)==0) {
                    cnt++;
                }
            }
            long ret = 1;
            for(int i=1; i<=cnt; i++) {
                ret*=i;
                ret = ret % MOD;
            }
            dic[selected] = ret;
            return ret;
        }
        long ans = 0;
        for(int i=0; i<this.Length; i++) {
            ulong key = (ulong)1<<i;
            if((selected&key)>0) {
                continue;
            }
            ans+=this.GetAns(selected+key, flags2);
            ans = ans % MOD;
        }
        this.dic[selected] = ans;
        return ans;
    }

    private const long MOD = 1000000000 + 7;

    private int Length = 0;

    private ulong[] NumList;
    public class Reader {
        public static bool IsDebug = true;
        private static System.IO.StringReader SReader;
        private static string InitText = @"




";
        public static string ReadLine() {
            if(IsDebug) {
                if(SReader == null) {
                    SReader = new System.IO.StringReader(InitText.Trim());
                }
                return SReader.ReadLine();
            } else {
                return Console.ReadLine();
            }
        }
    }
    public static void Main(string[] args)
    {
        Program prg = new Program();
        prg.Proc();
    }
}