Sunny loves playing childhood games even he is professional. Today he remembers a game in which we have to draw a shape without lifting our pencil. The description of shape that he has is a series of curved non-overlapping lines. You have to just print YES in case its possible to draw the shape without lifting pencil or else print NO.

YOU CAN NOT TRACE A LINE TWICE

Input
First line contains a number N as input which is total number of line segments in the shape.
Each of the next N lines contain description of each non overlapping curve in the form \(x_1, y_1, x_2, y_2\) which means curve connects points \((x_1,y_1)\) and \((x_2,y_2)\) in the x-y plane

Output
Output YES if the shape can be drawn without lifting the pencil or else print NO

Constraints
\(1 \le N \le 10^5\)
\(1 \le x_1, y_1, x_2, y_2 \le 10^9\)