Draw grid.
1 - 0, 2 - 0, 2 - 1, 3 - 1, 4 - 1, 4 - 2, 4 - 3, 5 - 3, 6 - 3, 6 - 4.
11 routes.
There are exactly possibilities:
1: - - — — —
2: - — - — —
3: - — — - —
4: - — — — -
5: — - - — —
6: — - — - —
7: — - — — -
8: — — - - —
9: — — - — -
0: — — — - -