#!/usr/bin/env python3
import re
from collections import defaultdict

lines = (x.strip() for x in open("input.txt"))
points = defaultdict(int)

for line in lines:
    [x1, y1, x2, y2] = list(map(int, re.match(r"(\d+),(\d+) -> (\d+),(\d+)", line).groups()))
    if x1 == x2:
        for y in range(min(y1, y2), max(y1, y2)+1):
            key = '{},{}'.format(x1, y)
            points[key] = points[key] + 1
    elif y1 == y2:
        for x in range(min(x1, x2), max(x1, x2)+1):
            key = '{},{}'.format(x, y1)
            points[key] = points[key] + 1

print(sum(1 if val >= 2 else 0 for val in points.values()))