from random import randint
 
death = 0
 
for x in range(0,10000):
	damage = 0
	for x in range(0, 3):
		attack = randint(1,20)
		if attack == 20:
			damage += 2*(randint(1,8))+3
		elif attack+5 >= 18:
			damage += randint(1,8)+3
 
		attack = randint(1,20)
		if attack == 20:
			damage += 2*(randint(1,6))+3
		elif attack+5 >= 18:
			damage += randint(1,6)+3
 
		attack = randint(1,20)
		if attack == 20:
			damage += 2*(randint(1,6))+3
		elif attack+5 >= 18:
			damage += randint(1,6)+3
	if damage >= 24:
		death += 1
 
print death

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