// File 1752.cpp created on 22.04.2025 at 10:44:08
#include <bits/stdc++.h>
using i64 = long long;
#ifdef DEBUG
#include "/home/ahmetalp/Desktop/Workplace/debug.h"
#else
#define debug(...) void(23)
#endif
constexpr int max_N = int(2E5) + 5;
int N, D;
std::vector<int> adj[max_N];
std::deque<int> dp[max_N];
std::vector<int> aux;
void dfs(int v) {
for (auto& u : adj[v]) {
dfs(u);
if (dp[u].size() > dp[adj[v][0]].size()) {
std::swap(u, adj[v][0]);
}
}
if (adj[v].empty()) {
dp[v].emplace_back(1);
return;
}
std::swap(dp[v], dp[adj[v][0]]);
dp[v].emplace_front(dp[v][0]);
if (int(dp[v].size()) > D) {
dp[v][0] = std::max(dp[v][0], dp[v][D] + 1);
}
debug(v, adj[v][0], dp[v]);
for (auto u : adj[v]) {
if (u == adj[v][0]) {
continue;
}
int m = int(dp[u].size());
aux.assign(m + 1, 0);
for (int i = 0; i <= m; ++i) {
int T = i, H;
int mx = dp[v][T];
H = std::max({0, T - 1, D - T - 1});
if (int(dp[u].size()) > H) {
debug("a", T, H, dp[v][T] + dp[u][H]);
mx = std::max(mx, dp[v][T] + dp[u][H]);
}
H = std::max({0, T, D - T});
if (T - 1 >= 0 && int(dp[v].size()) > H) {
debug("b", T, H, dp[v][H] + dp[u][T - 1]);
mx = std::max(mx, dp[v][H] + dp[u][T - 1]);
}
debug(T, mx);
aux[T] = mx;
}
for (int i = 0; i <= m; ++i) {
dp[v][i] = std::max(dp[v][i], aux[i]);
}
for (int i = std::min(m, int(dp[v].size()) - 2); i >= 0; --i) {
dp[v][i] = std::max(dp[v][i], dp[v][i + 1]);
}
debug(v, u, dp[v]);
}
debug(v, dp[v]);
}
int main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
std::cin >> N >> D;
for (int i = 1; i < N; ++i) {
int X;
std::cin >> X;
adj[X].emplace_back(i);
}
dfs(0);
auto dp0 = dp[0];
std::cout << dp0[0] << '\n';
return 0;
}
