小芳的妈妈每天给她2.5元，她都会存起来，但是每当这一天是存钱的第五天或者5的倍数的话，妈妈会给她5元钱，请问经过多少天小芳才可以存到100元钱？

Question

运行结果是35，正确答案是34，所以是哪个地方错了呢？
public class Money {

public static void main(String[] args) {
    double moneyday = 2.5;
    double money = 5;
    double sum = 0;
    double moneysum = 100;
    int day = 1;
    while (sum < moneysum) {
        if (day % 5 == 0) {
            sum += money;
        } else {
            sum += moneyday;
        }
        day++;
    }
    System.out.println(day);
}

}

Answer 1

 public static void main(String []args) {
    double moneyday = 2.5;
    double money = 5;
    double sum = 0;
    double moneysum = 100;
    int day = 0;
       do{
           day++; 
        if (day % 5 == 0) {
            sum += money;
        } else {
            sum += moneyday;
        }
           System.out.println(day);
       }while (sum < moneysum);
    }