function main() {
	while (true) {
		Sleep(300000);
        
        var account = $.GetAccount();
        var ticker = exchange.GetTicker();
        var stockValue = account.Stocks * ticker.Last;
        var totalValue = stockValue + account.Balance;
        var position = stockValue / totalValue;
        var trade_amount = 0;
        if ( position > TARGET_POSITION + ACT_DIFF ) {
            trade_amount = (position - TARGET_POSITION) * totalValue / ticker.Buy;