function main() {
    mcc = $.NewMarketCenterClient()
    Log('support list: '+mcc.GetSupportList())
    mcc.SubscribeSpotTicker('binance.com', 'BTC_USDT', 200)
    Sleep(1000)
    Log("start...")
    var count = 0
    
    var max = -1
    var min = 9999999
    var ave = 0
    var sum = 0