object Main {
  def main(args: Array[String]) {
    val sc = new java.util.Scanner(System.in)
    val x = sc.nextInt
    val y = sc.nextInt
    val z = sc.nextInt

    println(go(x, y, z, 0, z))
  }

  def go(x: Int, y: Int, z: Int, count: Int, now: Int): Int = {
    if (now == x) count
    else if (now > x) count - 1
    else go(x, y, z, count+1, now + y + z)
  }
}

