Unable to insert three new accounts with 'Acme Inc' in the name

public class AccountHandler {

public static void insertAccount(Integer newaccounts){

        Integer n = 1;

        List<Account> addAccounts = new List<Account>();

        while(n <= newaccounts){

           //create a new account

            Account store = new Account();

            store.Name = 'Acme Inc  ' + n;

            store.AccountNumber = 'A000' + n;

            addAccounts.add(store);

            //increment n

            n = n + 1;

            System.debug('n after incrementing: ' + n);

        }

         //insert all of the accounts in the list

        insert addAccounts;

    }

}