Hard puzzle

(kg5e20v3)

1
7
1
1
2
1
4
5
1
2
2
1
2
1
1
2
5
1
1
4
1
1
1
1
1
3
1
1
2
3
1
1
1
1
1
1
2
1
1
1
1
4
4
1
1
1
1
1
1
3
1
1
1