package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	m := Matrix{}

	s := bufio.NewScanner(os.Stdin)
	for s.Scan() {
		var x1, x2, y1, y2 int
		_, _ = fmt.Sscanf(s.Text(), "%d,%d -> %d,%d", &x1, &y1, &x2, &y2)
		m.DrawLine(x1, y1, x2, y2)
	}

	sum := 0
	for _, count := range m {
		if count > 1 {
			sum++
		}
	}
	fmt.Println(sum)
}