verbose = True

def is_safe(nums):
	print("is_safe")
	increasing = (nums[1] - nums[0]) > 0
	for i in range(1, len(nums)):
		diff = nums[i] - nums[i - 1]
		if abs(diff) > 3 or abs(diff) == 0 or increasing != (diff > 0):
			if verbose:
				print(f"unsafe: {line}", end="")
			return False
	if verbose:
		print(f"  safe: {line}", end="")
	return True
	

safe = 0
unsafe = 0
with open("input", "r") as fp:
	while line := fp.readline():
		nums = list(map(int, line.split(" ")))
		if is_safe(nums):
			safe += 1
			continue

		# Try omitting one of the numbers.
		if verbose:
			print("START try to omit one:")
		for i in range(len(nums)):
			new_nums = nums.copy()
			new_nums.pop(i)
			if is_safe(new_nums):
				safe += 1
				break
		else:
			unsafe += 1
		if verbose:
			print("STOP trying to omit one.")

print(f"Found {safe} safe and {unsafe} unsafe reports.")