Well done! That's the right answer.
Hint



Test
5
3
6
4
7
12 =
5
+
+
7
2
5
4
3
13 =
7
+
+
6
3
5
4
7
15 =
6
+
+
3
4
5
6
5
2
1
11 =
3
+
+
7
3
4
2
6
3
1
15 =
7
+
+