#include <bits/stdc++.h>
using namespace std;
int n, a, b;
int member[100004];
int sum;
;
int main() {
  member[1] = 1;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a >> b;
    member[a]++;
    member[b + 1]--;
  }
  sum = 0;
  for (int i = 1; i < n; i++) {
    member[i + 1] += member[i];
    if (i + 1 <= member[i + 1]) sum = i;
  }
  cout << sum << endl;
}
