#include <fstream>
using namespace std;

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


const int SIZE1 = 100 000;
const int SIZE2 = 100 000;

int main()
{
    int left[SIZE1];
    int right[SIZE2];

    int n, m, k;
    in >> n >> m >> k;

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

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

    out << k;
}