kernel version for ntt docomo galaxy s2?

[Android Question]

Hi can anyone help me in finding the kernel version to use for rooting my galaxy s2 ntt docomo? I bought phone from a friend with no clue as for rooting. kernel version:3.0.15-1233969 se.infra@SEI-32 #3 SMP PREEMPT
any help would be great..newbie..