Why is the denial of the cogito ergo sum not contradictory?

Explanation:

I think, therefore I am  or Cogito ergo sum  was the conclusion the phylosopher René Descartes arrived after a process of meditation and some eliminaton in order to find evidence for existence. By the time he perceived that "I" (and ability to think) could be the starting point that would lead to other evidences, he no longer dreaded doubts because this is also a consequence of 'I think', and evidence that 'I am'.

answer; (true);

answer; ///attempts to change more than once behavior at the same time;