Number of loops

Input

The first line contains the number of vertices n~(1 \le n \le 100). Each of the following $n$ lines contains the description of all edges outgoing from vertex $i$. The description begins with the number of outgoing edges, followed by the list of vertices to which these edges go. All vertices are numbered with integers from $1$ to $n$.

Output

Print the number of loops in the graph.

Examples