function main(){
    var initAccount = _C(exchange.GetAccount)
    if (initAccount.Stocks < SELLAMOUNT){
        throw 'check your account amount to sell'
    }
    while(true){
        var account = _C(exchange.GetAccount)
        var dealAmount =  initAccount.Stocks - account.Stocks
        var ticker = _C(exchange.GetTicker)
        if(SELLAMOUNT - dealAmount >= SELLSIZE){
            var id = exchange.Sell(ticker.Buy, SELLSIZE)
            Sleep(INTERVAL*1000)