function main() {
    var ticker = exchange.GetTicker()
    if(!ticker){
        return  'Unable to get price'
    }
    for(var i=0;i<N;i++){
        if(Type == 0){
            if(exchange.GetName().startsWith('Futures')){
                exchange.SetDirection('buy')
            }
            exchange.Buy(Start_Price-i*Spread,Amount+i*Amount_Step)