#include <fstream>
using namespace std;

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


const int SIZE1 = 100000;
const int SIZE2 = 100000;

int l[SIZE1];
int r[SIZE2];

int main()
{
    int n, m, k;
    in >> n >> m >> k;

    for (int i = 0; i < m; i++)
    {
        in >> l[i];
        in >> r[i];
    }

    for (int i = m - 1; i >= 0; i--)
    {
        if (k < l[i])
            continue;
        else
        {
            k = k + r[i] - l[i] + 1;
        }
    }

    out << k;
}