SieveOfEratosthenes

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SieveOfEratosthenes
{
    class SieveOfEratosthenes
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());
            bool[] primes = new bool[n+1];
            for (int i = 0; i <= n; i++)
            {
                primes[i] = true;
            }
            primes[0] = false;
            primes[1] = false;
            for (int p = 0; p < n; p++)
            {
                if (primes[p])
                {
                    for (int j = 2; j*p <= n; j++)
                    {
                        primes[j*p] = false;
                    }
                }
            }
            for (int i = 0; i < primes.Length; i++)
            {
                if (primes[i])
                {
                    Console.Write(i+" ");
                }
            }
        }
    }
}