package main

import ( "fmt"
         "time"
         "runtime"
       )

func main(){
  duration := time.Second
  durMin := time.Minute
  fmt.Println("Hello World! 0")
  time.Sleep(duration)
  fmt.Println("Hello World! 1")
  time.Sleep(duration)
  fmt.Println("Hello World! 2")
  time.Sleep(duration)
  fmt.Printf("Hello from: %s %s\n",runtime.GOOS,runtime.GOARCH)
  time.Sleep(durMin)
}

// testing