using System;
public class Program
{
public static void Main()
Console.WriteLine("for:");
for(int i=1;i<= 32768;i=i*2){
Console.Write("{0} ",i);
}
Console.WriteLine("\nwhile:");
int j = 1;
while (j <= 32768){
Console.Write("{0} ",j);
j = j*2;
Console.WriteLine("\ndo-while:");
int k = 1;
do{
Console.Write("{0} ",k);
k = k*2;
}while (k <= 32768);