// you can use print for debugging purposes, e.g.
// print "this is a debug message\n";

function solution($A) 
{
	// this can be also solved with 
	// return count(array_unique($A));
	// array which contains distinct values of array $A
	$distinct = array();
	foreach($A as $value) 
	{
		// saving distinct values by key ensures uniqueness
		if(empty($distinct[$value]))
			$distinct[$value] = $value;
	}
	// number of distinct values in array $A
	$distinctCount = count($distinct);
	return $distinctCount;
}

// you can use print for debugging purposes, e.g.
// print "this is a debug message\n";

function solution($A) 
{
	// this can be also solved with 
	return count(array_unique($A));
}

// you can use print for debugging purposes, e.g.
// print "this is a debug message\n";

function solution($A) 
{
	// this can be also solved with 
	return count(array_unique($A));
}

// you can use print for debugging purposes, e.g.
// print "this is a debug message\n";

function solution($A) 
{
	// this can be also solved with 
	return count(array_unique($A));
}

// you can use print for debugging purposes, e.g.
// print "this is a debug message\n";

function solution($A) 
{
	// this can be also solved with 
	return count(array_unique($A));
}

// you can use print for debugging purposes, e.g.
// print "this is a debug message\n";

function solution($A) 
{
	// this can be also solved with 
	return count(array_unique($A));
}

// you can use print for debugging purposes, e.g.
// print "this is a debug message\n";

function solution($A) 
{
	// this can be also solved with 
	return count(array_unique($A));
}