using System.Collections.Generic;
using System.Linq;
using System;
public class RemovedNumbers {
  public static List<long[]> removNb(long n) {
    return Enumerable.Range((int)n/2,(int)n/2) .Where(x=>(double)(n*(n+1)/2-x)/(x+1)%1==0) .Select(x=>new long[]{x,(n*(n+1)/2-x)/(x+1)}) .ToList();
  }
}