#include <bits/stdc++.h>
#include <atcoder/all>

using namespace std;
using ll = long long;
#define rep(i, s, t) for (ll i = s; i < (ll)(t); i++)
#define all(x) begin(x), end(x)
template <class T> bool chmin(T& x, T y) {
	return x > y ? (x = y, true) : false;
}
template <class T> bool chmax(T& x, T y) {
	return x < y ? (x = y, true) : false;
}

void solve() {
	int n;
	cin >> n;
	vector<int> a(n), b(n);
	rep(i, 0, n) cin >> a[i] >> b[i];
	vector<int> p(n);
	iota(all(p), 0);
	sort(all(p), [&](int i, int j) {
		return a[i] < a[j];
	});
	int mx = 1;
	for (int i : p) {
		if (a[i] > mx) break;
		chmax(mx, b[i]);
	}
	cout << mx << '\n';
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout << fixed << setprecision(15);
	int t = 1;
	// cin >> t;
	while (t--) solve();
}