import scala.io.StdIn._

object Main{
    def main(args: Array[String]): Unit ={
        val n : Int = readLine().toInt
        val degrees : Array[Int] = Array.fill(n)(0)
        for(_ <- 1 until n){
            val Array(a, b) : Array[Int] = readLine().split(' ').map(_.toInt)
            degrees(a-1) += 1
            degrees(b-1) += 1
        }
        var ans : Int = 0
        for(i <- 0 until n){
            ans += math.max(0, degrees(i)-2)
        }
        println(ans)
    }
}