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

#include <bits/stdc++.h>
using namespace std;
const int c = 1002;
int n, x, t[c], kov[c], ert;
bool v[c];
int main() {
  ios_base::sync_with_stdio(false);
  cin >> n >> x;
  for (int i = 1; i <= n; i++) {
    cin >> t[i];
    if (t[i]) {
      kov[t[i]] = i;
    }
  }
  v[0] = true;
  for (int i = 1; i <= n; i++) {
    if (!t[i]) {
      int db = 0, sp = 0, pos = i;
      while (pos) {
        db++;
        if (pos == x) {
          ert = db, sp = 1;
        }
        pos = kov[pos];
      }
      if (!sp) {
        for (int i = n; i >= 0; i--) {
          if (v[i]) {
            v[i + db] = true;
          }
        }
      }
    }
  }
  for (int i = 0; i <= n; i++) {
    if (v[i]) {
      cout << i + ert << "\n";
    }
  }
  return 0;
}
