#include <stdio.h>
#define L 100001
using namespace std;
int vx[L], vy[L];
int main(){
  FILE *fin, *fout;
  int n, m, k, i;
  fin=fopen("stergeri.in", "r");
  fscanf(fin, "%d%d%d", &n, &m, &k);
  for(i=0; i<m; i++)
    fscanf(fin, "%d%d", &vx[i], &vy[i]);
  fclose(fin);
  for(i=m-1; i>=0; i--)
    if(k>=vx[i])
      k=k+vy[i]-vx[i]+1;
  fout=fopen("stergeri.out", "w");
  fprintf(fout, "%d\n", k);
  fclose(fout);
  return 0;
}