Problem: There is a cave consisting of N rooms and M one-directional passages. The rooms are numbered 1 through N.

Takahashi is now in Room 1, and Room N has the exit. The i-th passage connects Room s_i and Room t_i (s_i < t_i) and can only be traversed in the direction from Room s_i to Room t_i. It is known that, for each room except Room N, there is at least one passage going from that room.

Takahashi will escape from the cave. Each time he reaches a room (assume that he has reached Room 1 at the beginning), he will choose a passage uniformly at random from the ones going from that room and take that passage.

Aoki, a friend of Takahashi's, can block one of the passages (or do nothing) before Takahashi leaves Room 1. However, it is not allowed to block a passage so that Takahashi is potentially unable to reach Room N.

Let E be the expected number of passages Takahashi takes before he reaches Room N. Find the value of E when Aoki makes a choice that minimizes E.

Constraints

* 2 \leq N \leq 600
* N-1 \leq M \leq \frac{N(N-1)}{2}
* s_i < t_i
* If i != j, (s_i, t_i) \neq (s_j, t_j). (Added 21:23 JST)
* For every v = 1, 2, ..., N-1, there exists i such that v = s_i.

Input

Input is given from Standard Input in the following format:


N M
s_1 t_1
:
s_M t_M


Output

Print the value of E when Aoki makes a choice that minimizes E. Your output will be judged as correct when the absolute or relative error from the judge's output is at most 10^{-6}.

Examples

Input

4 6
1 4
2 3
1 3
1 2
3 4
2 4


Output

1.5000000000


Input

3 2
1 2
2 3


Output

2.0000000000


Input

10 33
3 7
5 10
8 9
1 10
4 6
2 5
1 7
6 10
1 4
1 3
8 10
1 5
2 6
6 9
5 6
5 8
3 6
4 8
2 7
2 9
6 7
1 2
5 9
6 8
9 10
3 9
7 8
4 5
2 10
5 7
3 5
4 7
4 9


Output

3.0133333333

Solution (in PYTHON3):

Solution:
N, M = map(int, input().split())
E = [set() for i in range(N)]
for i in range(M):
  s, t = map(int, input().split())
  s, t = s-1, t-1
  E[s].add(t)
Vs = [1000000.0]*N
Vs[-1] = 0
for i in reversed(range(N-1)):
  js = E[i]
  v = 0
  for j in js:
    v += Vs[j]
  v = 1+v/len(js)
  Vs[i] = v
r = Vs[0]
rs = [r]
Vs0 = Vs
for n in range(N-1):
  Vs = [1000000.0]*N
  for i in range(n+1, N):
    Vs[i] = Vs0[i]
  for i in reversed(range(n+1)):
    js = E[i]
    if i == n:
      jmin = max(js, key=lambda j: Vs[j])
      js = js-{jmin}
    if len(js) == 0:
      break
    #p = 1/len(js)
    v = 0
    for j in js:
      v += Vs[j]
    v = 1+v/len(js)
    Vs[i] = v
  r = Vs[0]
  rs.append(r)
#print(rs)
r = min(rs)
print(r)