#include <fstream>

using namespace std;
pair<int, int> v[100010];

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

    fin>>n>>k>>q;
    for (i=1;i<=k;i++) {
        fin>>v[i].first>>v[i].second;
    }

    for (i=k;i>=1;i--)
        if (q >= v[i].first)
            q += (v[i].second - v[i].first + 1);

    fout<<q;

    return 0;
}