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#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>

using namespace std;

int n, a, b, c, K, M, k, m;
long long result;

int tab[2005][2005];
int baza1[2005];
int baza2[2005];

unsigned long long int czy[2005][35];
unsigned long long int tablica[65];

vector <pair <int, pair <int, int> > > v;
vector <pair <int, pair <int, int> > >::iterator it;

vector <int> pomoc;

void wewnetrzna (int x, int y)
{
	int z = baza1[x];
	if (z > y)
	{
		baza1[x] = y;
		baza2[y] = x;
		if (baza1[y + 1] == 0)
		{
			baza2[z] = y + 1;
			baza1[y + 1] = z;
		}
		else
		{
			baza2[z] = 0;
			wewnetrzna(y + 1, z);
		}
	}
	else
	{
		if (baza1[z + 1] == 0)
		{
			baza2[y] = z + 1;
			baza1[z + 1] = y;
		}
		else wewnetrzna(z + 1, y);
	}
}

void zewnetrzna (int x, int y)
{
	int z = baza2[y];
	if (z < x)
	{
		baza2[y] = x;
		baza1[x] = y;
		if (baza2[x - 1] == 0)
		{
			baza1[z] = x - 1;
			baza2[x - 1] = z;
		}
		else
		{
			baza1[z] = 0;
			zewnetrzna(z, x - 1);
		}
	}
	else
	{
		if (baza2[z - 1] == 0)
		{
			baza1[x] = z - 1;
			baza2[z - 1] = x;
		}
		else zewnetrzna(x, z - 1);
	}
}

void funkcja (int, int);

void podwojna (int x, int y)
{
	int z = baza1[x];
	int w = baza2[y];
	if (w > z) funkcja(z + 1, w - 1);
	else
	{
		pomoc.clear();
		pomoc.push_back(z);
		pomoc.push_back(w);
		pomoc.push_back(x);
		pomoc.push_back(y);
		sort(pomoc.begin(), pomoc.end());
		int x1 = pomoc[0];
		int x2 = pomoc[1];
		int x3 = pomoc[2];
		int x4 = pomoc[3];
		baza1[x2] = x3;
		baza2[x3] = x2;
		baza1[x1] = 0;
		baza2[x4] = 0;
		funkcja(x1, x2 - 1);
		funkcja(x3 + 1, x4);
	}
}

void funkcja (int x, int y)
{
	if (baza1[x] == 0)
	{
		if (baza2[y] == 0)
		{
			baza1[x] = y;
			baza2[y] = x;
		}
		else zewnetrzna(x, y);
	}
	else
	{
		if (baza2[y] == 0) wewnetrzna(x, y);
		else podwojna(x, y);
	}
}

int main ()
{
	tablica[0] = 1;
	for (int i = 1; i < 64; ++i) tablica[i] = 2 * tablica[i - 1];
	scanf("%d",&n);
	K = (n - 1) / 64;
	M = n % 64;
	if (M == 0) M = 64;
	for (int i = 1; i <= n; ++i) for (int j = i; j <= n; ++j)
	{
		scanf("%d",&tab[i][j]);
		v.push_back(make_pair(tab[i][j], make_pair(i, j)));
	}
	sort(v.begin(), v.end());
	for (it = v.begin(); it != v.end(); ++it)
	{
		a = it->second.first;
		b = it->second.second;
		c = it->first;
		if ((czy[a][(b - 1) / 64] & tablica[(b - 1) % 64]) == 0)
		{
			result += (long long)(tab[a][b]);
			funkcja(a, b);
			k = K;
			m = M;
			for (int i = n; i > 0; --i)
			{
				int q = baza1[i];
				if (q > 0)
				{
					q++;
					for (int j = k; j <= K; ++j)
					{
						czy[i][j] = czy[q][j];
					}
					q -= 2;
					czy[i][q / 64] |= tablica[q % 64];
				}
				m--;
				if (m == 0)
				{
					m = 64;
					k--;
				}
			}
		}
	}
	printf("%lld\n",result);
	return 0;
}