#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n, D; cin>>n>>D;
vector<int> g[n + 1];
for (int i = 2; i <= n; i++){
int p; cin>>p; p++;
g[p].pb(i);
g[i].pb(p);
}
vector<vector<int>> dist(n + 1, vector<int>(n + 1));
function<void(int, int, int&)> dfs = [&](int v, int pr, int& k){
for (int i: g[v]){
if (i == pr) continue;
dist[k][i] = dist[k][v] + 1;
dfs(i, v, k);
}
};
for (int i = 1; i <= n; i++) dfs(i, 0, i);
vector<int> d(n + 1);
function<void(int, int)> fill = [&](int v, int pr){
for (int i: g[v]){
if (i == pr) continue;
d[i] = d[v] + 1;
fill(i, v);
}
};
fill(1, 0);
vector<int> all;
for (int i = 1; i <= n; i++) all.pb(i);
int out = 0;
while (!all.empty()){
out++;
pii mx = {-1, 0};
for (int i: all){
mx = max(mx, {d[i], i});
}
vector<int> nw;
for (int i: all){
if (dist[mx.ss][i] >= D){
nw.pb(i);
}
}
all = nw;
}
cout<<out<<"\n";
}
