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

r=lambda:map(int,raw_input().split())
n,x=r()
a=[0]+r()
v=[0]*(n+1)
for i in range(n+1):
    if a[i]:
        v[a[i]] = i
r={0}
X=1
for i in range(1,n+1):
    if a[i] < 1:
        k = 1
        z = i
        f=0
        while z:
            if z == x:
                X=k;f=1
                break
            z = v[z]
            k+=1
        if not f: r|={j + k - 1 for j in r}

print '\n'.join(`i + X` for i in sorted(list(r)))