public class NumberDigits {
    public static int sumOfThirteen(int a) {
        int temp, tn = 0, colv = 0;
        for (int i = 0; i <= a; i++) {
            tn = i;
            temp = 0;
            while (tn >= 1) {
                temp += tn % 10;
                tn /= 10;
            }
            if (temp == 13) {
                System.out.println(i);
                colv++;
            }
        }
        return colv;
    }
}