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#ifdef DEBUG
#define _GLIBCXX_DEBUG
#endif
//#pragma GCC optimize("O3")
#include<bits/stdc++.h>
using namespace std;

#ifdef DEBUG
#include "lib/debug.h"
#else
#define debug(...) 228
#endif

#define pb push_back

typedef long long ll;
typedef long double ld;

ll n;
int m;
const int maxN = 2005;
ll l[maxN], r[maxN];
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
#ifdef DEBUG
    freopen("input.txt", "r", stdin);
#endif
    ll s;
    cin >> n >> m >> s;
    vector<ll> cands{s};
    for (int i = 1; i <= m; i++) {
        cin >> l[i] >> r[i];
        if (l[i] > 1) cands.emplace_back(l[i] - 1);
        if (r[i] + 1 <= n) cands.emplace_back(r[i] + 1);
    }
    pair<ll,ll> best = {1e18, 1e18};
    for (auto& it : cands) {
        ll who = it;
        bool ok = true;
        for (int j = 1; j <= m; j++) {
            if (l[j] <= who && who <= r[j]) {
                ok = false;
                break;
            }
        }
        if (ok) {
            best = min(best, make_pair(abs(s - who), who));
        }
    }
    cout << best.second;
    return 0;
}