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#include <cstdio>
#include <iostream>
#include <algorithm>
#include <cstring>
#include <vector>
#include <set>
#include <map>
#include <cmath>
#include <list>
#include <ctime>
#include <sstream>
#include <queue>
#include <stack>
#include <bitset>
#include <unordered_set>
#include <unordered_map>
using namespace std;
typedef vector<int> vi;
typedef pair<int,int> pii;
typedef long long ll;
typedef short int sint;
#define FOR(x, b, e) for(int x=(b); x<=(e); ++x)
#define FORD(x, b, e) for(int x=((int)(b))-1; x>=(e); --x)
#define REP(x, n) for(int x=0; x<(n); ++x)
#define VAR(v,n) typeof(n) v=(n)
#define ALL(c) c.begin(),c.end()
#define SIZE(x) ((int)((x).size()))
#define FOREACH(i,c) for(VAR(i,(c).begin());i!=(c).end();++i)
#define PB push_back
#define ST first
#define ND second
#define mp(x,y) make_pair(x,y)
#define DEBUG 1
#define debug(x) {if (DEBUG)cerr <<#x <<" = " <<x <<endl; }
#define debugv(x) {if (DEBUG) {cerr <<#x <<" = "; FOREACH(it, (x)) cerr <<*it <<", "; cout <<endl; }}
#define REMAX(a,b) (a)=max((a),(b));
#define REMIN(a,b) (a)=min((a),(b));
#define wez(n) int (n); scanf("%d",&(n));
#define wez2(n,m) int (n),(m); scanf("%d %d",&(n),&(m));

const int N = (1 << 11);
int c[N][N];
int n;

int main() {
	scanf("%d", &n);
	FOR(i, 1, n) FOR(j, i, n) {
		scanf("%d", &c[i][j]);
	}
	ll res = 0;
	FOR(i, 1, n) {
		int kt = i, tmp = c[i][i];
		FOR(j, i+1, n) {
			if (tmp > c[i][j]) {
				tmp = c[i][j];
				kt = j;
			}
		}
		res = res + tmp;
		FOR(j, i, kt - 1) {
			REMIN(c[j+1][kt], c[i][j])
		}
		FOR(j, kt + 1, n) {
			REMIN(c[kt+1][j], c[i][j]);
		}
	}
	printf("%lld\n", res);
	return 0;
}