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Number of elements from the array which are reachable after performing given operations on D | Function to return the GCD of a and b.
Function to return the count of reachable integers from the given array.
GCD of A and B.
To store the count of reachable integers.
If current element can be reached.
Return the count.
Driver code"
Solution in Python:

Give me a code to number of elements from the array which are reachable after performing given operations on D and the other steps required?
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#Here is code to number of elements from the array which are reachable after performing given operations on D and the other steps required.
 def GCD ( a , b ) :
	if ( b == 0 ) :
		return a ;
	return GCD ( b , a % b ) ;
def findReachable ( arr , D , A , B , n ) :
	gcd_AB = GCD ( A , B ) ;
	count = 0 ;
	for i in range ( n ) :
		if ( ( arr [ i ] - D ) % gcd_AB == 0 ) :
			count += 1 ;
	return count ;
arr = [ 4 , 5 , 6 , 7 , 8 , 9 ] ;
n = len ( arr ) ;
D = 4 ; A = 4 ; B = 6 ;
print ( findReachable ( arr , D , A , B , n ) ) ;