Not able to create directories in hadoop using mkdir

Not able to create directories in hadoop using command
hadoop fs -mkdir -p /user/itsuresh/sd1/sd2/sd3.

Getting error mkdir: Permission denied: user=itsuresh81, access=WRITE, inode="/user/itsuresh/sd1/sd2/sd3":hdfs:hdfs:drwxr-xr-x.

What am I doing wrong here.