#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
const int MAX_N = 18 + 5, INF = 1e9;
int n, d;
array<vector<int>, MAX_N> adj;
array<array<int, MAX_N>, MAX_N> dist;
void precomp() {
for (int u = 1; u <= n; u++) {
fill(dist[u].begin(), dist[u].end(), INF);
for (int v : adj[u]) dist[u][v] = 1;
dist[u][u] = 0;
}
for (int u = 1; u <= n; u++)
for (int v = 1; v <= n; v++)
for (int w = 1; w <= n; w++)
dist[u][v] = min(dist[u][v], dist[u][w] + dist[w][v]);
}
vector<pii> order;
array<bool, MAX_N> del;
int comp() {
for (int u = 1; u <= n; u++) {
int score = 0;
for (int v = 1; v <= n; v++)
score += (dist[u][v] < d);
order.push_back({score, u});
}
sort(order.begin(), order.end());
int ans = 0;
for (pii x : order) {
int u = x.second;
if (del[u]) continue;
ans++;
for (int v = 1; v <= n; v++)
if (dist[u][v] < d) del[v] = true;
}
return ans;
}
int main() {
// freopen("cat.in", "r", stdin);
cin >> n >> d; assert(n <= 18);
for (int u = 2; u <= n; u++) {
int v; cin >> v; v++;
adj[u].push_back(v), adj[v].push_back(u);
}
precomp();
int ans = comp();
cout << ans << '\n';
}
