#include <fstream>
using namespace std;

ifstream cin ("stergeri.in");
ofstream cout ("stergeri.out");

pair <int , int> intervale[100001];

int main ()
{
    int limita , stergeri , pozitie;
    cin >> limita >> stergeri >> pozitie;

    for (int indice = 1 ; indice <= stergeri ; indice++)
        cin >> intervale[indice].first >> intervale[indice].second;

    for (int indice = stergeri ; indice ; indice--)
        if (intervale[indice].first <= pozitie)
            pozitie += intervale[indice].second - intervale[indice].first + 1;

    cout << pozitie;
    cout.close(); cin.close();
    return 0;
}