package main

import (
    "fmt"
    "sync"
)

func printNumbers(wg *sync.WaitGroup) {
    for i := 1; i <= 5; i++ {
        fmt.Println(i)
    }
    wg.Done()
}

func main() {
    var wg sync.WaitGroup
    wg.Add(1)
    go printNumbers(&wg)
}