There are 5 points P₁, P₂, P₃, P₄, P₅ on the side AB, excluding A and B, of a triangle ABC. Similarly, there are 6 points P₆, P₇,..., P₁₁ on the side BC and 7 points P₁₂, P₁₃,..., P₁₈ on the side CA. The number of triangles that can be formed using the points P₁, P₂,..., P₁₈ as vertices is: