1
+
0
=
1
1
+
1
=
2
1
+
2
=
3
1
+
3
=
4
1
+
4
=
5
1
+
5
=
6
1
+
6
=
7
1
+
7
=
8
1
+
7
=
8
1
+
8
=
9
1
+
1
=
1
+
2
=
1
+
3
=
1
+
4
=
1
+
5
=
1
+
6
=
1
+
7
=
1
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8
=
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