#include <fstream>
#define nmax 100001
using namespace std;
ifstream f("stergeri.in");
ofstream g("stergeri.out"); 
int x[nmax], y[nmax], n, m, k, i;
 int main()
 {
 f>>n>>m>>k;
 for (i=1; i<=m; i++) 
 f>>x[i]>>y[i];
 for (i=m; i; i--) 
 if (x[i]<=k)
  k+=(y[i]-x[i]+1);
  g<<k;
  g.close();
  }