Allen, having graduated from the MOO Institute of Techcowlogy (MIT), has started a startup! Allen is the president of his startup. He also hires $n-1$ other employees, each of which is assigned a direct superior. If $u$ is a superior of $v$ and $v$ is a superior of $w$ then also $u$ is a superior of $w$. Additionally, there are no $u$ and $v$ such that $u$ is the superior of $v$ and $v$ is the superior of $u$. Allen himself has no superior. Allen is employee number $1$, and the others are employee numbers $2$ through $n$.

Finally, Allen must assign salaries to each employee in the company including himself. Due to budget constraints, each employee's salary is an integer between $1$ and $D$. Additionally, no employee can make strictly more than his superior.

Help Allen find the number of ways to assign salaries. As this number may be large, output it modulo $10^9 + 7$.

The first line of the input contains two integers $n$ and $D$ ($1 \le n \le 3000$, $1 \le D \le 10^9$).

The remaining $n-1$ lines each contain a single positive integer, where the $i$-th line contains the integer $p_i$ ($1 \le p_i \le i$). $p_i$ denotes the direct superior of employee $i+1$.

Output a single integer: the number of ways to assign salaries modulo $10^9 + 7$.