#include<bits/stdc++.h>
using namespace std;
typedef pair<int, int> pii;
#define fi first
#define sc second
int n, d;
vector<vector<int>> adj;
pii dfs(int u) {
pii ans={1, 0};
for (auto v : adj[u]) {
pii ch=dfs(v);
ans.fi+=ch.fi;
if (ans.sc+ch.sc+1<d) {
ans={ans.fi-1, max(ans.sc, ch.sc+1)};
} else ans.sc=min(ans.sc, ch.sc+1);
} return ans;
}
int main() {
cin.tie(0)->sync_with_stdio(false);
cin >> n >> d;
adj.assign(n+1, vector<int>());
for (int i = 1; i < n; ++i) {
int a;
cin >> a;
adj[a].push_back(i);
}
cout << dfs(0).first << '\n';
return 0;
}
