#include <stdio.h>

struct nr{
int x,y;
};

nr v[100002];
int n,m,k,i;

int main()
 {FILE *f;

  f=fopen("stergeri.in","r");
  fscanf(f,"%d %d %d",&n,&m,&k);
  for (i=1;i<=m;i++)
     fscanf(f,"%d %d",&v[i].x,&v[i].y);
  fclose(f);

  for (i=m;i>=1;i--)
    if (k>=v[i].x) k+=v[i].y-v[i].x+1;

  f=fopen("stergeri.out","w");
  fprintf(f,"%d",k);
  fclose(f);

  return 0;
  }