def amountOfEvenDigits(x):

   cnt = 0

   while x > 0:

       cnt += (1 - (x % 10) % 2)

       x //= 10

   return cnt

n = int(input("Input a number: "))

print("Amount of Even digits of number " + str(n) + " = " + str(amountOfEvenDigits(n)))