#include <bits/stdc++.h>

using namespace std;
using ll = long long;

const int MAXN = 1001;
const int INF = 1e9+100;

int a[MAXN][MAXN], n;

bool f(int x) {
    vector<vector<int>> g(n+1);
    vector<int> mt(n+1, -1);
    vector<bool> vis(n+1);
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= n; j++) {
            if (a[i][j] >= x) {
                g[i].emplace_back(j);
            }
        }
    }

    auto try_kuhn = [&](auto &&self, int u) -> bool {
        if (vis[u]) return false;
        vis[u] = 1;
        for (int v : g[u]) {
            if (mt[v] == -1 || self(self, mt[v])) {
                mt[v] = u;
                return true;
            }
        }
        return false;
    };
    for (int i = 1; i <= n; i++) {
        fill(vis.begin(), vis.end(), 0);
        try_kuhn(try_kuhn, i);
    }
    return count(mt.begin(), mt.end(), -1) == 1;
}

void solve() {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= n; j++) {
            cin >> a[i][j];
        }
    }
    int lo = 0, hi = INF;
    while (lo < hi) {
        int mid = (lo + hi + 1) / 2;
        if (f(mid)) lo = mid;
        else hi = mid-1;
    }
    cout << lo << "\n";
}

int main() {
    ios::sync_with_stdio(0); cin.tie(0);
    int t = 1; 
    // cin >> t;
    while (t--) solve();
    return 0;
}