using System;
using System.Collections.Generic;
public class MainClass
{
static public IEnumerable<int> Powers( int from,
int to ) {
for( int i = from; i <= to; ++i ) {
yield return (int) Math.Pow( 2, i );
}
}
static void Main() {
IEnumerable<int> powers = Powers( 0, 16 );
foreach( int result in powers ) {
Console.WriteLine( result );
}
}
}