21
+
3
=
10
+
8
=
2
+
10
=
49
+
47
=
39
+
2
=
13
+
52
=
2
+
3
=
33
+
25
=
50
+
35
=
35
+
54
=
77
+
15
=
14
+
7
=
7
+
1
=
13
+
0
=
24
+
3
=
29
+
48
=
44
+
10
=
10
+
25
=
20
+
12
=
28
+
17
=