나무
Time Limit: 5 SecMemory Limit: 1024 MiB
Example Input 1
7 314 3 1 4 1 5 9 2 6 5 3 5 8 9 7
Example Output 1
YES
Example Input 2
5 100 10 10 10 10 10 11 11 11 11 11
Example Output 2
NO
7 314 3 1 4 1 5 9 2 6 5 3 5 8 9 7
YES
5 100 10 10 10 10 10 11 11 11 11 11
NO