safe_reports = 0
with open("part1_input.txt", "r") as file_input:
    for row in file_input:
        report = list(map(int, row.split(" ")))

        increasing = None
        report_size = len(report)
        safe_count = 0

        for i in range(report_size):
            if i == 0:
                continue

            current_number = report[i]
            last_number = report[i-1]

            difference = last_number - current_number

            # Figure out if we're increasing or decreasing values in this row
            if increasing is None:
                if difference < 0 and (abs(difference) < 4):
                    increasing = True
                elif difference > 0 and (abs(difference) < 4):
                    increasing = False
                else:
                    break
            # Once we figure it out just make sure we stay in our 3 pt range and don't
            # decrease if we're supposed to be increasing or vice versa
            elif increasing and (-4 < difference < 0):
                safe_count += 1
            elif not increasing and (0 < difference < 4):
                safe_count += 1
            else:
                break

            if safe_count == (report_size - 2):
                safe_reports += 1

print(safe_reports)