#!/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
    else:
        for i in range(0, abs(x1 - x2) + 1):
            key = '{},{}'.format(
                (x1 + i) if x1 <= x2 else (x1 - i),
                (y1 + i) if y1 <= y2 else (y1 - i)
            )
            points[key] = points[key] + 1

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