#include <fstream>

using namespace std;

const int MAX_N = 1e5;
int x[MAX_N + 1], y[MAX_N + 1];

int main() {
    ifstream fin("stergeri.in");
    ofstream fout("stergeri.out");
    int n, m, k;
    fin >> n >> m >> k;
    for (int i = 1; i <= m; i++) {
        fin >> x[i] >> y[i];
    }
    for (int i = m; i >= 1; i--) {
        if (k >= x[i]) {
            k += y[i] - x[i] + 1;
        }
    }
    fout << k;
    return 0;
}