import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class DLLNode<E> {
	protected E element;
	protected DLLNode<E> pred, succ;

	public DLLNode(E elem, DLLNode<E> pred, DLLNode<E> succ) {
		this.element = elem;
		this.pred = pred;
		this.succ = succ;
	}

	@Override
	public String toString() {
		return element.toString();
	}
}

class DLL<E> {
	private DLLNode<E> first, last;

	public DLL() {
		// Construct an empty SLL
		this.first = null;
		this.last = null;
	}

	public void deleteList() {
		first = null;
		last = null;
	}

	public int length() {
		int ret;
		if (first != null) {
			DLLNode<E> tmp = first;
			ret = 1;
			while (tmp.succ != null) {
				tmp = tmp.succ;
				ret++;
			}
			return ret;
		} else
			return 0;

	}

	public DLLNode<E> find(E o) {
		if (first != null) {
			DLLNode<E> tmp = first;
			while (tmp.element != o&&tmp.succ != null)
				tmp = tmp.succ;
			if (tmp.element == o) {
				return tmp;
			} else {
				System.out.println("Elementot ne postoi vo listata");
			}
		} else {
			System.out.println("Listata e prazna");
		}
		return first;
	}

	public void insertFirst(E o) {
		DLLNode<E> ins = new DLLNode<E>(o, null, first);
		if (first == null)
			last = ins;
		else
			first.pred = ins;
		first = ins;
	}

	public void insertLast(E o) {
		if (first == null)
			insertFirst(o);
		else {
			DLLNode<E> ins = new DLLNode<E>(o, last, null);
			last.succ = ins;
			last = ins;
		}
	}

	public void insertAfter(E o, DLLNode<E> after) {
		if(after==last){
			insertLast(o);
			return;
		}
		DLLNode<E> ins = new DLLNode<E>(o, after, after.succ);
		after.succ.pred = ins;
		after.succ = ins;
	}

	public void insertBefore(E o, DLLNode<E> before) {
		if(before == first){
			insertFirst(o);
			return;
		}
		DLLNode<E> ins = new DLLNode<E>(o, before.pred, before);
		before.pred.succ = ins;
		before.pred = ins;
	}

	public E deleteFirst() {
		if (first != null) {
			DLLNode<E> tmp = first;
			first = first.succ;
			if (first != null) first.pred = null;
			if (first == null)
				last = null;
			return tmp.element;
		} else
			return null;
	}

	public E deleteLast() {
		if (first != null) {
			if (first.succ == null)
				return deleteFirst();
			else {
				DLLNode<E> tmp = last;
				last = last.pred;
				last.succ = null;
				return tmp.element;
			}
		}
		// else throw Exception
		return null;
	}

	public E delete(DLLNode<E> node) {
		if(node==first){
			deleteFirst();
			return node.element;
		}
		if(node==last){
			deleteLast();
			return node.element;
		}
		node.pred.succ = node.succ;
		node.succ.pred = node.pred;
		return node.element;

	}

@Override
	public String toString() {
		String ret = new String();
		if (first != null) {
			DLLNode<E> tmp = first;
			ret += tmp + "\n";
			while (tmp.succ != null) {
				tmp = tmp.succ;
				ret += tmp + "\n";
			}
		} else
			ret = "nema";
		return ret;
	}

	public String toStringR() {
		String ret = new String();
		if (last != null) {
			DLLNode<E> tmp = last;
			ret += tmp + "<->";
			while (tmp.pred != null) {
				tmp = tmp.pred;
				ret += tmp + "<->";
			}
		} else
			ret = "Prazna lista!!!";
		return ret;
	}

	public DLLNode<E> getFirst() {
		return first;
	}

	public DLLNode<E> getLast() {

		return last;
	}

	public void izvadiDupliIPrebroj(){

	}
}

 class Vraboten {
    public int id;
    public int plata;

    public Vraboten(int id, int plata) {
        this.id = id;
        this.plata = plata;
    }

    @Override
    public String toString() {
        return  id + " " + plata;
    }


}

public class DLLKompanija {


    public static DLL<Vraboten> podrediVraboten(DLL<Vraboten> lista, int iznos)
    {
        DLLNode<Vraboten> tmp=lista.getFirst();

        while(tmp!=null)
        {
            if(tmp.element.plata<iznos)
            {
                lista.delete(tmp);
            }
            tmp=tmp.succ;
        }

         tmp=lista.getFirst();
         while(tmp!=null)
         {
             DLLNode<Vraboten> tmpNext=tmp.succ;
             while(tmpNext!=null)
             {
                 if(tmp.element.id<tmpNext.element.id)
                 {
                     Vraboten v=tmp.element;
                     tmp.element=tmpNext.element;
                     tmpNext.element=v;

                 }
                 tmpNext=tmpNext.succ;
             }
             tmp=tmp.succ;
         }
        return lista;
    }
    public static void main(String[] args) throws IOException {
        DLL<Vraboten> lista = new DLL<Vraboten>();
        BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
        String s = stdin.readLine();
        int N = Integer.parseInt(s);


        for(int i =0; i< N; i++)
        {
            s = stdin.readLine();
            int id=Integer.parseInt(s);
            s = stdin.readLine();
            int plata=Integer.parseInt(s);
            lista.insertLast(new Vraboten(id, plata));
        }

        s = stdin.readLine();
        int iznos = Integer.parseInt(s);

        System.out.println(podrediVraboten(lista, iznos));
    }

}