#include <iostream>
#include <fstream>

using namespace std;

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

int x[100001], y[100001];

int main()
{
    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;
}