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#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx")
#pragma GCC optimize("unroll-loops")    
#include <bits/stdc++.h>
#define pb push_back
#define x first
#define y second
#define mp make_pair
#define len(a) int(a.size())
#define files(FILENAME) read(FILENAME); write(FILENAME)
#define read(FILENAME) freopen((string(FILENAME) + ".in").c_str(), "r", stdin)
#define write(FILENAME) freopen((string(FILENAME) + ".out").c_str(), "w", stdout)
using namespace std;
        
template<typename T1, typename T2>inline void chkmin(T1 &x, T2 y) { if (x > y) x = y; }
template<typename T1, typename T2>inline void chkmax(T1 &x, T2 y) { if (x < y) x = y; } 
template<typename T, typename U> inline ostream &operator<< (ostream &_out, const pair<T, U> &_p) { _out << _p.first << ' ' << _p.second; return _out; }
template<typename T, typename U> inline istream &operator>> (istream &_in, pair<T, U> &_p) { _in >> _p.first >> _p.second; return _in; }
template<typename T> inline ostream &operator<< (ostream &_out, const vector<T> &_v) { if (_v.empty()) { return _out; } _out << _v.front(); for (auto _it = ++_v.begin(); _it != _v.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline istream &operator>> (istream &_in, vector<T> &_v) { for (auto &_i : _v) { _in >> _i; } return _in; }
template<typename T> inline ostream &operator<< (ostream &_out, const set<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline ostream &operator<< (ostream &_out, const multiset<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline ostream &operator<< (ostream &_out, const unordered_set<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline ostream &operator<< (ostream &_out, const unordered_multiset<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T, typename U> inline ostream &operator<< (ostream &_out, const map<T, U> &_m) { if (_m.empty()) { return _out; } _out << '(' << _m.begin()->first << ": " << _m.begin()->second << ')'; for (auto _it = ++_m.begin(); _it != _m.end(); ++_it) { _out << ", (" << _it->first << ": " << _it->second << ')'; } return _out; }
template<typename T, typename U> inline ostream &operator<< (ostream &_out, const unordered_map<T, U> &_m) { if (_m.empty()) { return _out; } _out << '(' << _m.begin()->first << ": " << _m.begin()->second << ')'; for (auto _it = ++_m.begin(); _it != _m.end(); ++_it) { _out << ", (" << _it->first << ": " << _it->second << ')'; } return _out; }
        
typedef long long base; 
typedef pair<int, int> point;      
typedef complex<double> comp;

const int N = 505;

int n;
int w[N][N];
long long sum[2][N][N];
long long dp[N][N];

int main() {
    ios::sync_with_stdio(0);
    srand(time(0));
    cin >> n;
    for (int i = 1; i <= n; ++i) {
    	for (int j = 1; j <= n; ++j) {
    		if (i == j) continue;
    		cin >> w[i][j];
    		sum[i > j][min(i, j)][max(i, j) - 1] += w[i][j];
    	}
    }
    for (int i = n + 1; i--;) {
    	for (int j = i + 1; j <= n + 1; ++j) {
    		sum[0][i][j] += sum[0][i + 1][j] + sum[0][i][j - 1] - sum[0][i + 1][j - 1];
    		sum[1][i][j] += sum[1][i + 1][j] + sum[1][i][j - 1] - sum[1][i + 1][j - 1];
    	}
    }
    for (int i = 0; i <= n + 1; ++i) {
    	for (int j = 0; j <= n + 1; ++j) {
    		dp[i][j] = 1e18;
    	}
    }
    dp[0][0] = 0;
    for (int i = 0; i <= n; ++i) {
    	for (int j = i; j <= n; ++j) {
    		if (dp[i][j] == 1e18) continue;
    		for (int R = j + 1; R <= n + 1; ++R) {
    			long long d = sum[1][i + 1][n + 1] 
    						- sum[1][i + 1][R - 1] 
    						- sum[1][j + 1][n + 1] 
    						+ sum[1][j + 1][R - 1];
    			// cout << "? " << d << ' ' << i << ' ' << j << ' ' << R << endl;
    			d += sum[0][j + 1][R - 1];
    			// cout << "  " << d << ' ' << dp[i][j] + d << endl;
    			chkmin(dp[j][R], dp[i][j] + d);
    		}
       	}
    }
    long long ans = 1e18;
    for (int i = 0; i <= n; ++i) {
    	chkmin(ans, dp[i][n + 1]);
    }
    cout << ans << '\n';
}  

Measured memory_bytes: 7168