Problem: There is a directed graph G with N vertices and M edges. The vertices are numbered 1, 2, \ldots, N, and for each i (1 \leq i \leq M), the i-th directed edge goes from Vertex x_i to y_i. G does not contain directed cycles.

Find the length of the longest directed path in G. Here, the length of a directed path is the number of edges in it.

Constraints

* All values in input are integers.
* 2 \leq N \leq 10^5
* 1 \leq M \leq 10^5
* 1 \leq x_i, y_i \leq N
* All pairs (x_i, y_i) are distinct.
* G does not contain directed cycles.

Input

Input is given from Standard Input in the following format:


N M
x_1 y_1
x_2 y_2
:
x_M y_M


Output

Print the length of the longest directed path in G.

Examples

Input

4 5
1 2
1 3
3 2
2 4
3 4


Output

3


Input

6 3
2 3
4 5
5 6


Output

2


Input

5 8
5 3
2 3
2 4
5 2
5 1
1 4
4 3
1 3


Output

3

Solution (in PYTHON):

Solution:
import sys
raw_input = sys.stdin.readline
N,M = map(int,raw_input().split())
paths = [[] for x in range(N)]
inc = [0 for x in range(N)]
for i in range(M):
    a,b = map(int,raw_input().split())
    paths[a-1].append(b-1)
    inc[b-1] += 1
q = []
for i in range(N):
    if not inc[i]:
        q.append(i)
dp = [0 for x in range(N)]
while q:
    c = q.pop(0)
    for i in paths[c]:
        dp[i] = max(dp[i],dp[c]+1)
        inc[i] -= 1
        if not inc[i]:
            q.append(i)
print max(dp)