#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pii;
#define ff first
#define ss second
#define MP make_pair
template<typename T> void ono_min(T &MIN, T CMP) { if(MIN > CMP) MIN = CMP; }
template<typename T> void ono_max(T &MAX, T CMP) { if(MAX < CMP) MAX = CMP; }
const int inf = 1e9 + 10;
const int mxn = 2e5 + 10;
int dis[mxn], dp[mxn];
vector<int> adj[mxn];
int n, d, ans;
void dfs(int u, int p = 0) {
int mx = inf, cnt = 0;
for(int v : adj[u]) {
if(v == p) continue;
dfs(v, u);
if(mx + dis[v] >= d) {
cnt += dp[v];
ono_min(mx, dis[v]);
} else {
cnt += dp[v] - 1;
ono_max(mx, dis[v]);
}
}
if(mx >= d) {
dis[u] = 1;
dp[u] = cnt + 1;
} else {
dis[u] = mx + 1;
dp[u] = cnt;
}
ono_max(ans, dp[u]);
}
int main() {
cin >> n >> d;
for(int i = 1, j; i < n; i++) {
cin >> j;
adj[i].push_back(j);
adj[j].push_back(i);
}
dfs(0);
cout << ans << endl;
return 0;
}
