import java.util.ArrayList; import java.util.Arrays; import java.util.Scanner; class Main { public static void main(String[] args) { new Main().run(); } void run() { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int[][] f = new int[n][n]; for (int i = 0; i < n; ++i) { for (int j = 0; j < n; ++j) { f[i][j] = sc.nextInt(); } } int[] g = new int[1 << n]; Arrays.fill(g, -Integer.MAX_VALUE / 16); g[0] = 0; ArrayList lis = new ArrayList<>(); lis.add(0); for (int i = 0; i < n; ++i) { int sz = lis.size(); for (int j = 0; j < sz; ++j) { int s = lis.get(j); if (g[s] < 0) continue; if ((s & (1 << i)) > 0) { continue; } for (int ne = i + 1; ne < n; ++ne) { if ((s & (1 << ne)) > 0) { continue; } int ns = s | (1 << ne) | (1 << i); if (g[ns] < 0) { lis.add(ns); } g[ns] = Math.max(g[ns], g[s] + f[i][ne]); } } } System.out.println(g[(1 << n) - 1]); } static void tr(Object... objects) { System.out.println(Arrays.deepToString(objects)); } }