#include <cstdio>
#include <vector>

using namespace std;

int N,M,K;

vector <int> v;

void make_v()
{
  for(int i=1; i<=N; i++)
    v.push_back(i);
}

void solve()
{
  int x,y;
  for(int i=1; i<=M; i++)
  {
    scanf("%d %d",&x,&y);
    v.erase(v.begin()+x,v.begin()+y);
  }
  
  printf("%d\n",v[K+1]);
}

int main()
{
  freopen("stergeri.in","r",stdin);
  freopen("stergeri.out","w",stdout);
  
  scanf("%d %d %d",&N,&M,&K);
  
  make_v();
  solve();
}