#include <fstream>

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

int n, m, k, left, right;

int main()
{ 
    std::pair<int, int> v[1000000];
    fin >> n >> m >> k;
    for(int i = 0; i < m; ++i)
    {
      fin >> left >> right;
      v[i].first = left;
      v[i].second = right;
    }
    for(int i = m - 1; i >= 0; --i)
      if(k >= v[i].first) 
        k += v[i].second - v[i].first + 1;
    fout << k;
    return 0;
}