import os
import re
from collections import Counter

dir = os.path.dirname(os.path.abspath(__file__))

with open(os.path.join(dir, './input.txt'), 'r') as input_file:

    lines = input_file.readlines()

    max_x = 0
    max_y = 0

    parse_pattern = re.compile("(\d+),(\d+) -> (\d+),(\d+)")

    map = Counter()
    for line in lines:
        matches = re.search(parse_pattern, line.strip())
        x1 = int(matches.group(1))
        y1 = int(matches.group(2))
        x2 = int(matches.group(3))
        y2 = int(matches.group(4))

        if x1 == x2:
            start = min(y1,y2)
            end = max(y1,y2)
            for y in range(start, end+1):
                key = f"{x1},{y}"
                map[key] = map[key] + 1 
        elif y1 == y2:
            start = min(x1,x2)
            end = max(x1,x2)
            for x in range(start, end+1):
                key = f"{x},{y1}"
                map[key] = map[key] + 1

    count = 0
    for keys in map:
        if map[keys] >= 2:
            count = count + 1
    print(count)