Hackerrank Filling Jars in Scala. need more performant implementation

Filling Jars.scala

object Solution {
  def main(args: Array[String]) {
    val lines = io.Source.stdin.getLines().toList
    val jars  = lines(0).split("\\s+")(0).toInt
    val ops = lines.drop(1).map( l => l.split("\\s+").map(s => s.toLong))
    val rslt = ops.foldLeft(0L)( (acc, v) => acc + ( (v(1) - v(0) + 1) * v(2) ))
    println(rslt / jars)
  }
}

the performant implementation