Simple program to count prime number

PrimeCounter.py

#!/usr/bin/env python3
def isPrime(n):
#	if n < 2:
#		return False
#	elif n == 2:
#		return True
#	else:
		for i in range(2, n):
			p = n % i
			if p == 0:
				return False
				break
		return True
while True:
	try:
		r = int(input('Tampilkan Banyaknya Bilangan Prima antara 1 ~ '))
		break
	except ValueError:
		print('Please Enter Number Only!')
y = 0
for x in range(2, r + 1):
	if isPrime(x) == True:
		y += 1
print(y)