Java题，谁给个思路，只能用do-while

Question

用do-while循环输出1--50中，7的倍数之和

Answer 1

public class Test {
    public static void main(String[] args) {
        int sum = 0;
        int i = 1;
        do {
            if (i % 7 == 0) {
                sum += i;
            }
            i++;
        } while (i <= 50);
        System.out.println(sum);
    }
}