package main

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

type Point struct {
  x,y int
}

type Triangle struct {
  a,b,c Point
}

func readTriangle( str string ) (ret Triangle) {
  fmt.Sscanf(str, "%d,%d,%d,%d,%d,%d", &ret.a.x, &ret.a.y, &ret.b.x, &ret.b.y, &ret.c.x, &ret.c.y)
  return ret
}
func det( a, b Point) int {
  return a.x*b.y - a.y*b.x;
}

func signe( c, a Point) bool {
  return det(Point{ c.x - a.x, c.y - a.y}, Point{ -a.x, -a.y }) < 0
}


func main() {
  file, err := os.Open("p102_triangles.txt")
  cmp := 0

  if err != nil {
    log.Fatal(err)
  }
  
  defer file.Close()
  
  scan := bufio.NewScanner(file)
  scan.Split(bufio.ScanLines)

  for scan.Scan() {
    trian := readTriangle(scan.Text())

    sign := signe( trian.c, trian.a )

    if signe( trian.a, trian.b) == sign && signe( trian.b, trian.c ) == sign {
      cmp++
    }
  }

  fmt.Print(cmp);
}