CF900A Find Extra One

You have $ n $ distinct points on a plane, none of them lie on $ OY $ axis. Check that there is a point after removal of which the remaining points are located on one side of the $ OY $ axis.

The first line contains a single positive integer $ n $ ( $ 2

Print "Yes" if there is such a point, "No" — otherwise. You can print every letter in any case (upper or lower).

In the first example the second point can be removed. In the second example there is no suitable for the condition point. In the third example any point can be removed.