#include<cstdio>
#include<vector>


using namespace std;

using vi=vector<int>;
using vvi=vector<vi>;


void solve_i(vvi& f, long used, int score, vi& memo)
{
	int n=f.size();
	int i, j;

	if(memo[used]<score) memo[used]=score;

	if(used==((1<<n)-1))
	{
		return;
	}

	for(i=0;i<n;i++)
	{
		if((used>>i)&1) continue;
		used|=(1<<i);
		for(j=i+1;j<n;j++)
		{
			if((used>>j)&1) continue;
			used|=(1<<j);
			solve_i(f, used, score+f[i][j], memo);
			used&=~(1<<j);
		}
		used&=~(1<<i);
	}
}


int solve(vvi& f)
{
	int n=f.size();
	vi memo(1<<n);

	solve_i(f, 0, 0, memo);
	return memo[(1<<n)-1];
}


int main(void)
{
	vvi f;
	int n;

	while(scanf("%d", &n)==1)
	{
		f.resize(n);
		for(int i=0;i<n;i++)
		{
			f[i].resize(n);
			for(int j=0;j<n;j++) scanf("%d", &f[i][j]);
		}
		printf("%d\n", solve(f));
	}

	return 0;
}