In a tennis tournament, $N = 1234567890$ people participate.

The organizing committee numbered all the people as ${1,2,3,.....,N}$ based on their abilities (ability of participant 1 > ability of participant 2 > ability of participant 3 > … > ability of participant N).

Every participant has the same number (say M) of friends in the tournament. A participant calls himself $\textbf{superior}$ if his ability is greater than more than half of his friends.

For example, if $M = 13$, then a participant will consider himself superior if his ability is greater than $6$ of his friends, for $M = 14$, a participant will be superior if his ability is greater than $7$ of his friends.

Find the maximum possible number of participants that can consider themselves as $\textbf{superior}$.