using System;
 
public class Test
{
 
 
static long Pack(long a24, long b16, long c24) {
    return a24<<40 | (b16&0xffffL)<<24 | (c24&0xffffff);
}
static void Unpack(long packed, out int a24, out int b16, out int c24) {
    a24 = (int)(packed >> 40); // Sign extension is done in the long
    b16 = ((int)(packed >> 8)) >> 16; // Sign extension is done in the int
    c24 = ((int)(packed << 8)) >> 8;  // Sign extension is done in the int
}
 
 
	public static void Main()
	{
		long p = Pack(0xFFABCD89, 0x7EDC, 0x123456);
		Console.WriteLine("{0:x}", p);
		int a, b, c;
		Unpack(p, out a, out b, out c);
		Console.WriteLine("{0:x} {1:x} {2:x}", a, b, c);
	}
}

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