java　while　numが100以下のときに3の倍数を加算していく方法。

変数 int num にシステムから入力値が与えられる。変数numの値が100以下の時にループ処理を行うwhile文を宣言し、while文の処理では変数numに数値を加算していく。
加算する値は3の倍数を加算する。
（1回目の処理では+3、2回目の処理で+6, 3回目の処理で+9、…）
ループ後に変数の値を画面に表示し，処理結果が正しいことを確認したい。

import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
String text = scan.next();
int num = Integer.parseInt(text);

while(num<=100){
num=num+3;
}
System.out.print(num);
}
}

これだと常に入力値numに対して3を加算していっている…ということは理解しているのですが
n回目の処理のときの3の倍数の表現方法が不明です。
ヒントを頂けないでしょうか。

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