#include <any>
#include <bits/stdc++.h>
#include <cstddef>
#include <deque>
#include <utility>
#include <vector>
using namespace std;
//#pragma GCC optimize ("O3")
//#pragma GCC target ("sse4")
#define endl "\n"
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; }
#ifndef LOCAL
#define cerr if(false) cerr
#endif
#define out( x ) #x << " = " << x << " "
template<typename T, typename S> ostream& operator << (ostream &os, const pair<T, S> &p) {
return os << "(" << p.first << ", " << p.second << ")";
}
template<typename T, typename B = decay<decltype(*begin(declval<T>()))>, typename enable_if<!is_same<T, string>::value>::type* = nullptr>
ostream& operator <<(ostream &os, const T &c) {
bool f = false;
os << "(";
for(const auto &x : c) {
if(f) {
os << ", ";
}
f = true;
os << x;
}return os << ")";
}
typedef long long ll;
const ll mod = 1e9 + 7;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
const int MAX_N = 2e5 + 10;
int n, D;
std::vector< int > v[MAX_N];
std::deque< int > dp[MAX_N];
void dfs( int x, int par = -1 ){
dp[x].push_front( 1 );
for( auto j : v[x] ){
dfs( j, x );
dp[j].push_front( dp[j][0] );
cerr << out( x ) << out( j ) << endl;
if( dp[j].size() > dp[x].size() ){
std::swap( dp[j], dp[x] );
}
cerr << out( dp[x] ) << out( dp[j] ) << endl;
int szJ = dp[j].size();
int szX = dp[x].size();
for( int i=0 ; i < szJ ; i++ ){
int d = std::max( i, D - i );
int A = ( szJ > d ? dp[j][d] + dp[x][i] : dp[x][i] );
int B = ( szX > d ? dp[x][d] + dp[j][i] : dp[x][i] );
dp[x][i] = std::max( A, B );
}
for( int i=szJ -1 ; i >= 0 ; i-- ){
if( i + 1 < szX ) chkmax( dp[x][i], dp[x][i + 1] );
}
dp[j].clear();
}
}
void solve() {
std::cin >> n >> D;
for( int i=1 ; i < n ; i++ ){
int a, b;
std::cin >> a;
b = i;
v[a].push_back( b );
}
dfs( 0 );
cerr << out( dp[0] ) << endl;
ll nas = dp[0][0];
//for( auto j : dp[0] ) chkmax( nas, j );
std::cout << nas << endl;
}
signed main() {
#ifndef LOCAL
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#endif
int t = 1;
//cin >> t;
while(t --) {
solve();
}
return 0;
}
