#include <bits/stdc++.h>
using namespace std;
const int MAX_N = 100001;
int s[MAX_N] = {0};
int main() {
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) {
    int a, b;
    cin >> a >> b;
    s[a]++, s[b + 1]--;
  }
  for (int i = 1; i < MAX_N; i++) {
    s[i] += s[i - 1];
  }
  int ans = 1;
  for (int i = 1; i < MAX_N; i++) {
    if (i - 1 <= s[i]) ans = i;
  }
  ans--;
  cout << ans << endl;
}
