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#include <iostream>
#include <vector>
using namespace std;

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);

  long long n, m, s;
  cin >> n >> m >> s;

  vector<bool> v(n + 1, false);
  v[0] = true;
  v[s] = true;

  while (m--) {
    long long x, y;
    cin >> x >> y;

    for (long long i = x; i <= y; i++) v[i] = true;
  }

  long long l = s - 1, r = s + 1;
  while (v[l] && l) l--;
  while (v[r] && r <= n) r++;

  if (!v[l] && s - l <= r - s)
    cout << l;
  else
    cout << r;
}