#include <iostream>
#include <fstream>

using namespace std;

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

const int N = 2000000003;
const int M = 100003;

int n, m, k, x, y, st, dr, nr;

struct elem{
    int s, d;
};
elem a[M];

int main()
{
    int i;
    in >> n >> m >> k;
    for ( i = 1; i <= m; i++ )
        in >> a[i].s >> a[i].d;
    for ( i = m; i >= 1; i-- )
    {
        if ( k <= a[i].d && k >= a[i].s )
            k+= a[i].d - a[i].s + 1;
        else if ( k > a[i].d )
            k+= a[i].d - a[i].s + 1;
    }
    out << k;
    return 0;
}