#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pull;
typedef pair<int, int> pii;
typedef pair<ld, ld> pld;
vector<int> g[200009];
int n, d;
int ans;
int dis[200009];
void dfs(int v){
vector<int> vec;
for(auto u : g[v]){
dfs(u);
vec.pb(dis[u]+1);
}
sort(vec.begin(), vec.end());
reverse(vec.begin(), vec.end());
while(vec.size() >= 2 && vec.back()+vec[vec.size()-2] < d){
vec.pop_back();
--ans;
}
if(vec.empty())
dis[v] = 1e9;
else
dis[v] = vec.back();
if(dis[v] >= d){
dis[v] = 0;
++ans;
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
//freopen("in.txt", "r", stdin);
//freopen("out.txt", "w", stdout);
cin >> n >> d;
for(int i = 1; i < n; ++i){
int prt;
cin >> prt;
g[prt].pb(i);
}
dfs(0);
cout << ans << '\n';
}
