/* 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
	{
        int a []  = {1, 4, 6, 7, 8, 10, 13};
        int b []  = {1, 2, 3, 4, 5, 6, 7};
 
       System.out.println( "Equal = " + equal(a,b));
 
    }
 
  public static int equal(int[] a, int[] b){
  	 Set<Integer> setA = new HashSet<>();
  	 Set<Integer> setB = new HashSet<>();
 
  	 for ( int i = 0; i < a.length; ++i ) {
  	 	setA.add( a[i] );
  	 }
  	 for ( int i = 0; i < b.length; ++i ) {
  	 	setB.add( b[i] );
  	 }
 
  	 int aSizeBefore = setA.size();
  	 setA.removeAll( setB );
  	 int aSizeAfter = setA.size();
  	 return aSizeBefore - aSizeAfter;
  }
}

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