object Main extends App {
      import java.math.{BigDecimal => JDecimal}
      import java.math.RoundingMode._
      import scala.concurrent.Future
      import scala.concurrent.Await
      import scala.concurrent.ExecutionContext.Implicits._
      import scala.concurrent.duration._
      val precision = 1800
 
      def acotPrecision(numDigits: Int)(x: BigDecimal) = {
        val x1 = x.underlying
        val two = JDecimal.valueOf(2)
        val xSquared = x1 pow 2
        val unity = JDecimal.ONE.setScale(numDigits, HALF_EVEN)
        var sum = unity.divide(x1, HALF_EVEN)
        var xpower = new JDecimal(sum.toString)
        var term = unity
 
        var add = false
 
        var n = JDecimal.valueOf(3).setScale(numDigits)
        while (term.setScale(numDigits, HALF_EVEN).compareTo(JDecimal.ZERO) != 0) {
          xpower = xpower.divide(xSquared, HALF_EVEN)
          term = xpower.divide(n, HALF_EVEN)
          sum = if (add) sum add term else sum subtract term
          add = !add
          n = n add two
        }
        sum
      }
 
      def ePrecision(numDigits: Int) = {
        val zero = JDecimal.ZERO
        var sum = zero
        var term = JDecimal.ONE.setScale(numDigits, HALF_EVEN)
        var n = JDecimal.ONE.setScale(numDigits, HALF_EVEN)
        while(term.setScale(numDigits, HALF_EVEN).compareTo(zero) != 0) {
          sum = sum add term
          term = term.divide(n, HALF_EVEN)
          n = n add JDecimal.ONE
        }
        sum
      }
 
      val acot = acotPrecision(precision) _
 
      def d(x: Int) = JDecimal.valueOf(x)
 
      def piFuture = Future(d(4) multiply (
        (d(83) multiply acot(107)) add (d(17) multiply acot(1710)) subtract (d(22) multiply acot(103697))
        subtract (d(24) multiply acot(2513489)) subtract (d(44) multiply acot(18280007883L))
       add (d(12) multiply acot(7939642926390344818L))
       add (d(22) multiply acot(BigDecimal("3054211727257704725384731479018")))
      ))
 
      def eFuture = Future(ePrecision(precision))
 
      Await.result(
        for (pi <- piFuture;
             e <- eFuture) yield println((pi multiply e).setScale(precision - 10, DOWN))
      , 5 seconds) 
    }

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