#include <bits/stdc++.h>
using namespace std;
//#pragma GCC optimize ("O3")
//#pragma GCC target ("sse4")
#ifndef LOCAL
#define cerr if(false) cerr
#endif
#define endl "\n"
#define all(x) (x).begin(), (x).end()
#define forn(i, n) for(int i = 0; i < n; i ++)
#define revn(i, n) for(int i = n - 1; i >= 0; i --)
typedef long long ll;
template<class T, template<class T2, class A=allocator<T2> > class cont> inline ostream &operator <<(ostream &out, const cont<T> &x) { for(const auto &it : x) { out << it << " ";} return out;}
template<class T, template<class T2, class A=allocator<T2> > class cont> inline istream &operator >>(istream &in, cont<T> &x) { for(auto &it : x) { in >> it;} return in;}
template<class T, class T2> inline ostream &operator <<(ostream &out, const pair<T, T2> &x) { out << x.first << " " << x.second; return out;}
template<class T, class T2> inline istream &operator >>(istream &in, pair<T, T2> &x) { in >> x.first >> x.second; return in;}
template<class T, class T2> inline bool chkmax(T &x, const T2 &y) { return x < y ? x = y, 1 : 0; }
template<class T, class T2> inline bool chkmin(T &x, const T2 &y) { return x > y ? x = y, 1 : 0; }
const ll mod = 1e9 + 7;
const int MAX_N = 1e6 + 10;
vector<int> g[MAX_N];
int n, d;
pair<int, int> dfs(int x, int p) {
vector<pair<int, pair<int, int> > > child;
int ret = 0;
int mn = mod;
for(auto it : g[x]) {
if(it == p) {continue;}
child.push_back({it, dfs(it, x)});
ret += child.back().second.first;
}
mn = mod;
sort(all(child), [](const pair<int, pair<int, int> > &a, const pair<int, pair<int, int> > &b){
return a.second.second < b.second.second;
});
if(!child.empty()) {
mn = child.back().second.second;
}
revn(i, child.size() - 1) {
if(child[i].second.second + child[i + 1].second.second < d) {
ret --;
} else {
chkmin(mn, child[i].second.second);
}
}
if(mn >= d) {
mn = 0;
ret ++;
}
cerr << "Returning from " << x << " " << p << " -> " << ret << " " << mn + 1 << endl;
return {ret, mn + 1};
}
signed main() {
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
cin >> n >> d;
forn(i, n - 1) {
int p;
cin >> p;
g[p].push_back(i + 1);
}
auto ans = dfs(0, -1).first;
cout << ans << endl;
return 0;
}
