#include "bits/stdc++.h"

using namespace std;

static int member[101010];

void solve()
{
  int n, a, b;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a >> b;
    member[a]++;
    member[b + 1]--;
  }
  partial_sum(begin(member), end(member), begin(member));
  for(int i = 101009; i > 0; i--) {
    if(member[i] >= i - 1) {
      cout << i - 1 << "\n";
      return;
    }
  }
}

int main()
{
  ios::sync_with_stdio(false);
  cin.tie();
  solve();
}