/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(Long.toHexString(nBytesFromXRestY(3, 0x45602345, 0x10299207)));
	}
 
	public static long nBytesFromXRestY(int n, long x, long y) {
        long mask = ~0L << (n * 8);
        return (x & mask) | ( y & ~mask);
    }
}

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