#!/usr/bin/gorun

package main

import (
    "fmt"
    "runtime"
    "sync"
)

var summ uint64
var wg sync.WaitGroup


func summator() {
    defer wg.Done()
    for i := uint64(0); i < 100000; i++ {
        summ = summ + 1
    }
}

func main() {
    wg.Add(100000)
    for i := uint64(0); i < 100000; i++ {
        go summator()
    }
    wg.Wait()
    fmt.Printf("summ == %d\n", summ)
}

func init() {
    runtime.GOMAXPROCS(runtime.NumCPU())
}