object Main extends App {
	val k = scala.io.StdIn.readLine.split(" ").map(_.toInt)
	
	val y = k(1)
	val z = k(2)

	var per = 0;
	var size = k(0) - z

	while(size >= 0){
		per = per + 1;
		size = size - y - z;
	}

	println(per - 1)

}