20 20
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 10 4
0 1 4 2 7 0 10 0 5 8
 10 7
10 8 6 5 0 0 0 4 3 9
 10 1
8 7 0 2 0 10 0 0 3 5
 10 7
7 9 2 10 0 0 0 3 5 1
 10 2
10 0 9 0 0 4 2 6 8 0
 10 2
0 7 0 10 8 0 4 2 3 0

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
 3
4
8
9
 1
5
6
10
 2
4
5
7
8
10
 1
2
6
7
 1
2
3
4
6
7
8
9
 4
5
6
7
8

I=lambda:map(int,raw_input().split())
n,x=I()
a=[0]+I()
v=[0]*(n+1)
r={0}
for i in range(n+1):v[a[i]]=i
for i in range(1,n+1):
 if a[i]<1:
	t=1
	while i:
	 if i==x:Z=t;break
	 t+=1;i=v[i]
	else:r|={j+t-1for j in r}
for i in sorted(r):print i+Z

