using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Numerics;

class Program
{
    static void Main(string[] args)
    {
        var wrong_answer = new wrong_answer();
        wrong_answer.Solve();
    }
}

public class wrong_answer
{
    const int INF = 1 << 30;
    const long INFL = 1L << 60;
    const int MOD = 1000000007;
    const int MOD2 = 998244353;

    myinout IO = new myinout();
    Math2 mmath = new Math2();

    //functions






    public void Solve()
    {
        var o = IO.intm;
        var h = o[0];
        var w = o[1];

        var dist = new int[h, w];

        var dist2 = new int[h, w];
        var s = Enumerable.Range(0, h).Select(_ => IO.charm).ToArray();
        int[] dx = { 1, 0, -1, 0 };
        int[] dy = { 0, 1, 0, -1 };
        int sx = 0;
        int sy = 0;
        var ans = 0;
        for (int fffff = 0; fffff < h; ++fffff)
        {
            for (int jjjjjj = 0; jjjjjj < w; ++jjjjjj)
            {
                if (s[fffff][jjjjjj] == '.')
                {
                    sx = fffff; sy = jjjjjj;
                    var q = new Queue<Tuple<int, int>>();
                    for (int i = 0; i < h; ++i) for (int j = 0; j < w; ++j) dist[i, j] = -1;
                    dist[sx, sy] = 0;
                    q.Enqueue(new Tuple<int, int>(sx, sy));
                    while (q.Count() > 0)
                    {
                        var xx = q.Dequeue();
                        var x = xx.Item1;
                        var y = xx.Item2;
                        for (int i = 0; i < 4; ++i)
                        {
                            if (x + dx[i] < 0 || y + dy[i] < 0 || x + dx[i] >= h || y + dy[i] >= w || s[x + dx[i]][y + dy[i]] == '#') continue;
                            if (dist[x + dx[i], y + dy[i]] != -1) continue;
                            dist[x + dx[i], y + dy[i]] = dist[x, y] + 1;
                            q.Enqueue(new Tuple<int, int>(x + dx[i], y + dy[i]));
                        }
                    }
                    var max = 0;
                    int maxx = 0;
                    int maxy = 0;
                    for (int i = 0; i < h; ++i)
                    {
                        for (int j = 0; j < w; ++j)
                        {
                            if (max < dist[i, j])
                            {
                                max = dist[i, j];
                                maxx = i;
                                maxy = j;
                            }
                        }
                    }
                    ans = Math.Max(ans, max);
                }
            }
        }





        IO.wri(ans);




    }



}





//b-aで降順

public class Math2
{
    public long[] fact;
    public long[] invfact;
    public void factoricalmodset(long N, long MOD = 1000000007)
    {
        fact = new long[N + 1];
        invfact = new long[N + 1];
        fact[0] = 1;

        for (long i = 1; i <= N; ++i)
        {
            fact[i] = fact[i - 1] * i % MOD;
        }
        invfact[N] = pow(fact[N], MOD - 2);

        for (long i = N; i > 0; --i)
        {
            invfact[i - 1] = invfact[i] * i % MOD;
        }

    }

    public long nCr(long n, long r, long MOD = 1000000007)
    {
        return (fact[n] * invfact[r] % MOD * invfact[n - r] % MOD);
    }

    public long pow(long i, long n, long MOD = 1000000007)
    {
        long res = 1;
        while (n > 0)
        {
            if ((n & 1) != 0) res = res * i % MOD;
            i = i * i % MOD;
            n >>= 1;
        }
        return res;
    }

    public long gcd(long i, long y)
    {
        while (y != 0)
        {
            var r = i % y;
            i = y;
            y = r;
        }
        return i;
    }

    public long lcm(long i, long y)
    {
        return i * y / gcd(i, y);
    }

    public Dictionary<long, int> primefactorization(long N)
    {
        var ret = new Dictionary<long, int>();

        for (long i = 2; i * i <= N; ++i)
        {
            int cnt = 0;
            while (N % i == 0)
            {
                cnt++;
                N /= i;
            }
            if (cnt != 0) ret[i] = cnt;

        }
        if (N >= 2) ret[N] = 1;

        return ret;

    }

    public List<long> divisorenumrate(long N)
    {
        var ret = new List<long>();

        for (long i = 1; i * i <= N; ++i)
        {

            if (N % i == 0)
            {
                ret.Add(i);
                ret.Add(N / i);
            }

        }

        return ret;

    }

    public void swap<T>(ref T a, ref T b)
    {
        var i = a;
        a = b;
        b = i;
    }

}

class myinout
{
    //in
    public string str => Console.ReadLine();

    public string[] strm => str.Split(' ');

    public long[] longm => strm.Select(long.Parse).ToArray();
    public int[] intm => strm.Select(int.Parse).ToArray();
    public char[] charm => str.ToArray();
    public double[] doublem => strm.Select(double.Parse).ToArray();
    public long long1 => longm[0];
    public int int1 => intm[0];
    public char char1 => charm[0];
    public double double1 => doublem[0];



    //out
    public void wri<T>(T i)
    {
        Console.WriteLine(i);
    }
    public void wri<T>(T[] i)
    {
        Console.WriteLine(string.Join(" ", i));
    }

    public void yn(bool i)
    {
        if (i) wri("Yes");
        else wri("No");
    }

}


Measured memory_bytes: 13652