#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

int main()
{
    ifstream fin("stergeri.in");
    ofstream fout("stergeri.out");
    int n,m,k;
    fin >> n >> m >> k;

    vector<pair<int,int> > operatii;

    for(int i = 0; i < m; i++)
    {
        pair<int, int> tm;
        fin >> tm.first >> tm.second;
        operatii.push_back(tm);
    }
    int poz = k;

    for(int i = m-1; i >= 0; i--){
        if(poz >= operatii[i].first)
            poz += operatii[i].second - operatii[i].first+1;


    }
    fout << poz;

    fin.close();
    fout.close();
    return 0;
}