#include <bits/stdc++.h>
using namespace std;

#define FOR(i, a, b) for(int i=(a);i<(b);++i)
#define REP(i, n)  for(int i=0;i<(n);++i)
#define REPr(i, n) for(int i=(n)-1;i>=0; --i)
#define FORq(i, m, n) for(int i = (m);i <= (n);++i)
#define FORqr(i, m, n) for(int i = (n);i >=(m);--i)
#define PB push_back
#define MP make_pair
#define fst first
#define snd second
#define SIN(x, S) (S.count(x) != 0)
#define M0(x) memset(x,0,sizeof(x))
#define FILL(x, y) memset(x,y,sizeof(x))
#define MM(x) memset(x,-1,sizeof(x))
#define ALL(x) (x).begin(),(x).end()
#define DB(x) cerr << #x << " = " << x << endl
#define DB2(x, y) cerr << "(" << #x << ", " << #y << ") = (" << x << ", " << y << ")\n";
#define DEBUG int x12345; cin >> x12345;
typedef pair<int, int> PII;
typedef pair<long long, long long> PLL;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<long long> VL;
typedef long long ll;
typedef long long integer;
///////////////////////////////////////////////
const ll MOD = 1e9 + 7;
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : x; }
 
template<class T>
inline bool chmin(T &a, T b) {
	if (a > b) {
		a = b;
		return true;
	}
	return false;
}
 
template<class T>
inline bool chmax(T &a, T b) {
	if (a < b) {
		a = b;
		return true;
	}
	return false;
}
 
template<int MOD>
struct Fp {
	long long val;
 
	constexpr Fp(long long v = 0) noexcept : val(v % MOD) {
		if (val < 0) v += MOD;
	}
 
	constexpr int getmod() { return MOD; }
 
	constexpr Fp operator-() const noexcept {
		return val ? MOD - val : 0;
	}
 
	constexpr Fp operator+(const Fp &r) const noexcept { return Fp(*this) += r; }
 
	constexpr Fp operator-(const Fp &r) const noexcept { return Fp(*this) -= r; }
 
	constexpr Fp operator*(const Fp &r) const noexcept { return Fp(*this) *= r; }
 
	constexpr Fp operator/(const Fp &r) const noexcept { return Fp(*this) /= r; }
 
	constexpr Fp &operator+=(const Fp &r) noexcept {
		val += r.val;
		if (val >= MOD) val -= MOD;
		return *this;
	}
 
	constexpr Fp &operator-=(const Fp &r) noexcept {
		val -= r.val;
		if (val < 0) val += MOD;
		return *this;
	}
 
	constexpr Fp &operator*=(const Fp &r) noexcept {
		val = val * r.val % MOD;
		return *this;
	}
 
	constexpr Fp &operator/=(const Fp &r) noexcept {
		long long a = r.val, b = MOD, u = 1, v = 0;
		while (b) {
			long long t = a / b;
			a -= t * b;
			swap(a, b);
			u -= t * v;
			swap(u, v);
		}
		val = val * u % MOD;
		if (val < 0) val += MOD;
		return *this;
	}
 
	constexpr bool operator==(const Fp &r) const noexcept {
		return this->val == r.val;
	}
 
	constexpr bool operator!=(const Fp &r) const noexcept {
		return this->val != r.val;
	}
 
	friend constexpr ostream &operator<<(ostream &os, const Fp<MOD> &x) noexcept {
		return os << x.val;
	}
 
	friend constexpr istream &operator>>(istream &is, Fp<MOD> &x) noexcept {
		return is >> x.val;
	}
 
	friend constexpr Fp<MOD> modpow(const Fp<MOD> &a, long long n) noexcept {
		if (n == 0) return 1;
		auto t = modpow(a, n / 2);
		t = t * t;
		if (n & 1) t = t * a;
		return t;
	}
};
 
using mint = Fp<MOD>;
 
void scdvec(vector<int> &a, int n, int s = 0) {
	for (int i = s; i < n; ++i) { scanf("%d", &a[i]); }
}
 
void sclldvec(vector<long long> &a, int n, int s = 0) {
	for (int i = s; i < n; ++i) { scanf("%lld", &a[i]); }
}
 
///////////////////////////////////////////////
///  ((((っ・ω・)っ |AC|

int dx[4] = {0,1,0,-1};
int dy[4] = {1,0,-1,0};


int main(){
	int H,W;
	cin >> H >> W;
	char grid[22][22] = {};
	FORq(i,1,H){
		FORq(j,1,W){
			cin >> grid[i][j];
		}
	}

	int ans = 0;

	FORq(i,1,H){
		FORq(j,1,W){
			int visited[22][22] = {};
			FORq(i,0,21){
				FORq(j,0,21){
					visited[i][j] = -1;
				}
			}

			if (grid[i][j] == '#') continue;

			queue<PII> Q;
			Q.push(MP(i,j));
			visited[i][j] = 0;

			while(!Q.empty()){
				int nowi = Q.front().fst;
				int nowj = Q.front().snd;
				Q.pop();

				REP(k,4){
					int nexti = nowi + dx[k];
					int nextj = nowj + dy[k];
					if (grid[nexti][nextj] != '.') continue;
					if (visited[nexti][nextj] >= 0) continue;
					visited[nexti][nextj] = visited[nowi][nowj] + 1;
					Q.push(MP(nexti,nextj));
				}
			}

			FORq(m,0,21){
				FORq(n,0,21){
					chmax(ans,visited[m][n]);
				}
			}
		}
	}

	cout << ans << endl;
}


Measured memory_bytes: 256