#!/usr/bin/env python

import re
from collections import defaultdict

RE_INPUT = re.compile(r'^(\d+),(\d+)\s*\->\s*(\d+),(\d+)')

def read_file(filename):
    file = open(filename, 'r')
    while True:
        line = file.readline()
        if not line:
            break
        yield line

def process_vent(coord, see_map):
    diff_x =  coord[2] - coord[0]
    diff_y =  coord[3] - coord[1]
    steps = max(abs(diff_x), abs(diff_y))
    diff_x = diff_x/steps;
    diff_y = diff_y/steps;

    for i in range(steps+1):
        k = "%d,%d" % (coord[0]+diff_x*i,coord[1]+diff_y*i)
        see_map[k] += 1        

def main():
    see_map = defaultdict(int)
    for line in read_file('input01.txt'):
        match = re.search(RE_INPUT, line)
        if not match:
            print("wrong syntax")
        vent =  [int(i) for i in match.groups()]
        process_vent(vent, see_map)

    result = sum([1 for i in see_map.values() if i > 1])
    print(result)

if __name__ == "__main__":
    main()