#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <sstream>
#include <functional>
#include <numeric>
#include <cmath>
#include <cstring>
#include <cstdio>
#include <queue>
#include <stack>
#include <set>

using namespace std;

#define ALL(co) co.begin(), co.end()
#define tpl(...) make_tuple(__VA_ARGS__)

typedef long long LL;
typedef pair<int, int> P; typedef pair<int, P> IP; typedef pair<P, P> PP;
typedef vector<int> Array; typedef vector<vector<int> > Array2;
typedef vector<LL> LArray; typedef vector<P> PArray; typedef vector<string> SArray;

const int INF = 1 << 29;
const LL LINF = 1LL << 60;

inline int getInt() { int itiv; return (cin >> itiv, itiv); }
template <typename T> void readAll(vector<T>& vec) { for (int i = 0, size = vec.size(); i < size; i++) cin >> vec[i]; }
template <typename T, typename U> void readAll(vector<pair<T, U> >& vec) { for (int i = 0, size = vec.size(); i < size; i++) cin >> vec[i].first >> vec[i].second; }
template < typename T > inline string toString( const T &a ){ ostringstream oss; oss << a; return oss.str(); };
inline bool between(int min, int max, int n) { return min <= n && n <= max; }
inline bool inRange(int begin, int end, int n) { return begin <= n && n < end; }
inline bool inRange(int size, int n) { return 0 <= n && n < size; }

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

int m, n;

int main(void)
{
	ios::sync_with_stdio(false);
	while(cin >> n >> m && n)
	{
		vector<vector<double> > table(n, vector<double>(n));
		for (int i = 0; i < n; i++)
		{
			readAll(table[i]);
		}
		
		vector<double> next(n);
		vector<double> now(n, 1);

		for (int i = 1; i < m; i++)
		{
			for (int j = 0; j < n; j++)
			{
				next[j] = now[0] * table[j][0];
				for (int k = 0; k < n; k++)
				{
					next[j] = max(next[j], now[k] * table[j][k]);
				}
			}
			now = next;
		}
		cout << (int)((*max_element(ALL(now)) + 0.005) * 100) / 100.0 << endl;
	}
	return 0;
}