function main() {
        var productGroups = AdsApp.productGroups()
            .withCondition('Clicks > 100')
            .withCondition('Ctr > 0.05')
            .forDateRange('LAST_MONTH')
            .get();
 
            while (productGroups.hasNext()) {
                var productGroup = productGroups.next();
                productGroup.setMaxCpc(productGroup.getMaxCpc() + 0.5);
 
            }
}