#include<iostream.h>
#include<fstream.h>
unsigned long N,M,K,l,j,i=1,x,y,v[1000];
int main()
{
 ifstream f("stergeri.in");
 ofstream g("stergeri.out");
 do
 {f>>N;}
 while((N<1)||(N>2000000000));
 do
  {f>>M;}
 while((M<1)||(M>100000));
 f>>K;
 while(i<=N)
  {v[i]=i;i++;}
 for(i=1;i<=M;i++)
  {f>>x>>y;
   for(l=1;l<=y-x+1;l++)
    for(j=x;j<N;j++)
     v[j]=v[j+1];
  }
 g<<v[K];
 f.close();g.close();
 return 0;
}