using System;
using System.IO;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Collections.Generic;
using Enu = System.Linq.Enumerable;

class Program
{
    static readonly int Mod = (int)1e9 + 7;
    void Add(ref long a, long b) { if ((a += b) >= Mod) a -= Mod; }

    void Solve()
    {
        int N = reader.Int();
        var C = ModC(N, Mod);
        var dp = new long[N + 1, N + 1];
        dp[0, 0] = 1;
        long ans = 0;

        for (int pair = 1; pair <= N; pair++)
            for (int numGroup = 1; numGroup <= pair; numGroup++)
            {
                Add(ref dp[pair, numGroup], dp[pair - 1, numGroup - 1]);
                Add(ref dp[pair, numGroup], dp[pair - 1, numGroup] * numGroup % Mod);
                long curr = C[N, pair] * dp[pair, numGroup] % Mod;
                int rem = N - pair;
                for (int i = 0; i < rem; i++)
                    curr = curr * numGroup * (numGroup - 1) % Mod;
                Add(ref ans, curr);
            }

        Console.WriteLine(ans);
    }

    static int[,] ModC(int n, int mod)
    {
        var c = new int[n + 1, n + 1];
        for (int i = 0; i <= n; i++)
        {
            c[i, 0] = c[i, i] = 1;
            for (int j = 1; j < i; j++)
                c[i, j] = (c[i - 1, j] + c[i - 1, j - 1]) % mod;
        }
        return c;
    }






    static void Main() { new Program().Solve(); }
    Reader reader = new Reader(Console.In);
    class Reader
    {
        private readonly TextReader reader;
        private readonly char[] separator = { ' ' };
        private readonly StringSplitOptions removeOp = StringSplitOptions.RemoveEmptyEntries;
        private string[] A = new string[0];
        private int i;

        public Reader(TextReader r) { reader = r; }
        public bool HasNext() { return Enqueue(); }
        public string String() { return Dequeue(); }
        public int Int() { return int.Parse(Dequeue()); }
        public long Long() { return long.Parse(Dequeue()); }
        public double Double() { return double.Parse(Dequeue()); }
        public int[] IntLine() { var s = Line(); return s == "" ? new int[0] : Array.ConvertAll(Split(s), int.Parse); }
        public int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
        public int[][] IntGrid(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
        public string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Line()).ToArray(); }
        public string Line() { return reader.ReadLine().Trim(); }
        private string[] Split(string s) { return s.Split(separator, removeOp); }
        private bool Enqueue()
        {
            if (i < A.Length) return true;
            string line = reader.ReadLine();
            if (line == null) return false;
            if (line == "") return Enqueue();
            A = Split(line);
            i = 0;
            return true;
        }
        private string Dequeue() { Enqueue(); return A[i++]; }
    }
}