unittest
{
	assert( [ "25" ].parse.expand.solve == "Christmas" );
	assert( [ "22" ].parse.expand.solve == "Christmas Eve Eve Eve" );
}



import std.conv;
import std.range;
import std.stdio;
import std.string;
import std.typecons;

void main()
{
	stdin.byLineCopy.parse.expand.solve.writeln;
}

auto parse( Range )( Range input )
if( isInputRange!Range && is( ElementType!Range == string ) )
{
	auto n = input.front.strip.to!( long );
	return tuple( n );
}

auto solve( long n )
{
	switch( n )
	{
		case 22: return "Christmas Eve Eve Eve";
		case 23: return "Christmas Eve Eve";
		case 24: return "Christmas Eve";
		case 25: return "Christmas";
		default: assert( false );
	}
}
