Well done! That's the right answer.
Hint



Test
5
4
6
3
7
16 =
5
+
+
6
5
7
5
4
18 =
6
+
+
7
8
5
10
4
19 =
7
+
+
3
4
8
5
4
7
5
16 =
3
+
+
7
3
4
5
6
3
9
18 =
7
+
+