OJ Board

Can anybody tell why sample input one should output 4 as number of ways???
Shouldn't that be 11 ????

why is the following not one of the answer

0 1 2 3 4 5 6 7
1 O O O O - - -
2 - - - O O O O
3 - - - - - - - O
4 - - - - - - - O
5 - - - - - - - O
6 - - - - - - - O

where garbages are located at (1 ...