#include <bits/stdc++.h>
using namespace std;
ifstream f("stergeri.in");
ofstream g("stergeri.out");

int main()
{
    vector <int> v;
    int n, k, m, x, y;
    f >> n >> m >> k;

    v.push_back(0);
    for(int i=1; i<=n; i++)
        v.push_back(i);

    while(m--)
    {
        f >> x >> y;
        v.erase(v.begin() + x, v.begin() + y+1);
    }
    g << v[k];
}