using System;
using System.Linq;
using System.Collections.Generic;

class p{
  static void Main() {
    var xs = new int[100000000];
    var r = new Random(666);
    for (int i = 0; i < xs.Length; i++){ xs[i] = r.Next(0,1000000000); }
    var sw = System.Diagnostics.Stopwatch.StartNew();

    Int64 sum = 0;
    //foreach(var x in xs.Where(x=>x > 1000).Where(x => x < 10000000).Where(x => x % 997 == 0)){
    //  sum += x;
    //}
    foreach(var x in xs) {
      if (x > 1000) {
        if (x < 10000000) {
          if (x % 997 == 0) {
            sum += x;
          }
        }
      }
    }

    var e = sw.Elapsed;
    Console.WriteLine(e + " - " + sum);
  }

}