#include <bits/stdc++.h>
using namespace std;
template <class T>
bool chmax(T &a, const T &b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
template <class T>
bool chmin(T &a, const T &b) {
  if (a > b) {
    a = b;
    return 1;
  }
  return 0;
}
template <class T>
ostream &operator<<(ostream &os, const vector<T> &t) {
  os << "[";
  for (__typeof((t).begin()) it = (t).begin(); it != (t).end(); it++) {
    if (it != t.begin()) os << ",";
    os << *it;
  }
  os << "]";
  return os;
}
template <class T>
ostream &operator<<(ostream &os, const set<T> &t) {
  os << "{";
  for (__typeof((t).begin()) it = (t).begin(); it != (t).end(); it++) {
    if (it != t.begin()) os << ",";
    os << *it;
  }
  os << "}";
  return os;
}
template <class S, class T>
ostream &operator<<(ostream &os, const pair<S, T> &t) {
  return os << "(" << t.first << "," << t.second << ")";
}
const int INF = 1 << 28;
const double EPS = 1e-8;
const int MOD = 1000000007;
int n;
int main() {
  while (cin >> n) {
    vector<int> im(100002);
    for (int i = 0; i < (int)(n); i++) {
      int x, y;
      cin >> x >> y;
      im[x--]++;
      im[y]--;
    }
    int ans = 0;
    for (int i = 0; i < (int)(n + 1); i++) {
      im[i + 1] += im[i];
      if (im[i + 1] > i) ans = i;
    }
    cout << ans << endl;
  }
  return 0;
}
