This time our child has a simple polygon. He has to find the number of ways to split the polygon into non-degenerate triangles, each way must satisfy the following requirements:

• each vertex of each triangle is one of the polygon vertex;
• each side of the polygon must be the side of exactly one triangle;
• the area of intersection of every two triangles equals to zero, and the sum of all areas of triangles equals to the area of the polygon;
• each triangle must be completely inside the polygon;
• each side of each triangle must contain exactly two vertices of the polygon.

The picture below depicts an example of a correct splitting.

Please, help the child. Calculate the described number of ways modulo 1000000007 (10⁹+7) for him.

The first line contains one integer n (3≤n≤200) − the number of vertices of the polygon. Then follow n lines, each line containing two integers. The i-th line contains x_i,y_i (|x_i|,|y_i|≤10⁷) − the i-th vertex of the polygon in clockwise or counterclockwise order.

It's guaranteed that the polygon is simple.

Output the number of ways modulo 1000000007 (10⁹+7).