using System;
using System.Globalization;
public class MainClass {
public static void Main() {
GregorianCalendar myCal = new GregorianCalendar();
// .
for ( int i = 0; i < myCal.Eras.Length; i++ ) {
Console.Write( "Era {0}:\t", myCal.Eras[i] );
for ( int y = 2001; y <= 2005; y++ ){
Console.Write( "\t{0}", myCal.GetDaysInMonth( y, 2, myCal.Eras[i] ) );
}
}
}
}