#include <bits/stdc++.h>
using namespace std;
//#define int long long
#define pii pair<int, int>
#define ff first
#define ss second
const int inf = 2e9;
const int mod = 1e9 + 7;
const int mxn = 2e5 + 1;
int exp(int x, int n)
{
int res = 1;
for (; n > 0; res = (n % 2 ? res * x % mod : res), x = x * x % mod, n /= 2)
;
return res;
}
int inv(int x)
{
return exp(x, mod - 2);
}
void solve()
{
int n, d;
cin >> n >> d;
vector<vector<int>> g(n);
for (int i = 1; i < n; i++)
{
int x;
cin >> x;
g[i].push_back(x);
g[x].push_back(i);
}
vector<int> depth(n, -1),p(n);
vector<vector<int>> lift(20,vector<int>(n));
function<int(int,int)> lca = [&](int a,int b)
{
if(depth[a]<depth[b])swap(a,b);
int raz = depth[a]-depth[b];
for(int bit = 19;bit >= 0;bit--)
if(raz&(1<<bit))
a = lift[bit][a];
for(int bit = 19;bit >= 0;bit--)
if(lift[bit][a]!=lift[bit][b])
a = lift[bit][a],b= lift[bit][b];
if(a!=b)
a = p[a];
return a;
};
function<int(int,int)> dist= [&](int a,int b)
{
return depth[a]+depth[b]-2*depth[lca(a,b)];
};
function<void(int, int)> dfs = [&](int cur, int prev)
{
depth[cur] = depth[prev] + 1;
for (int a : g[cur])
if (a != prev)
dfs(a, cur);
p[cur] = prev;
};
dfs(0, 0);
lift[0] = p;
for(int b = 1;b < 20;b++)
for(int i = 0; i <n; i++)
lift[b][i] = lift[b-1][lift[b-1][i]];
vector<vector<int>> anc(n);
vector<int> rem(n,0);
vector<int> sbt(n);
function<int(int,int)> getsz = [&](int cur,int prev)
{
sbt[cur] = 1;
for(int a: g[cur])
if(a!=prev && !rem[a])
sbt[cur]+=getsz(a,cur);
return sbt[cur];
};
function<int(int,int,int)> centroid = [&](int cur,int trsz,int prev)
{
for(int a : g[cur])
if(a!=prev && !rem[a])
if(sbt[a]*2>trsz)
return centroid(a,trsz,cur);
return cur;
};
function<void(int)> decomp = [&](int cur)
{
int c = centroid(cur,getsz(cur,cur),cur);
rem[c] = 1;
function<void(int,int)> doanc = [&](int cur,int prev)
{
anc[cur].push_back(c);
for(int a: g[cur])
if(a!=prev&&!rem[a])
doanc(a,cur);
};
doanc(c,c);
for(int a : g[c])
if(!rem[a])
decomp(a);
};
decomp(0);
int cnt = 0;
vector<int> vis(n, 0);
vector<int> id(n);
vector<int> mini(n,inf);
for (int i = 0; i < n; i++)
id[i] = i;
sort(id.begin(), id.end(), [&](int a, int b)
{ return depth[a] > depth[b]; });
for (int i : id)
{
bool stop = 0;
for(int a : anc[i])
if(mini[a]+dist(a,i) < d)
stop = 1;
if(stop)continue;
cnt++;
for(int a : anc[i])
mini[a] = min(mini[a],dist(a,i));
}
cout << cnt << '\n';
}
signed main()
{
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int t = 1;
// cin >>t;
while (t--)
solve();
return 0;
}
