m := make(map[string]int)
    for z := 0; z < 1e6; z++ {
        r := rand.NewSource(time.Now().UnixNano())
        money := 1000
        pay := 1
        i := 0
        for money-pay > 0 && i < 1e6 {
            money -= pay
            won := r.Int63()%2 == 1
            if won {
                money += pay*2
                pay = 1
            } else {
                pay *= 2
            }
            i++
        }
        if money > 1000 {
            m["won"]++
        } else {
            m["lost"]++
        }
    }
    fmt.Println("won  ::", m["won"])
    fmt.Println("lost ::", m["lost"])