#include <bits/stdc++.h>
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define rep(i,N) for(long long i = 0; i < (long long)(N); i++)
#define repr(i,N) for(long long i = (long long)(N) - 1; i >= 0; i--)
#define rep1(i,N) for(long long i = 1; i <= (long long)(N) ; i++)
#define repr1(i,N) for(long long i = (N) ; (long long)(i) > 0 ; i--)
#define each(x,v) for(auto& x : v)
#define all(v) (v).begin(),(v).end()
#define sz(v) ((int)(v).size())
#define ini(...) int __VA_ARGS__; in(__VA_ARGS__)
#define inl(...) long long __VA_ARGS__; in(__VA_ARGS__)
#define ins(...) string __VA_ARGS__; in(__VA_ARGS__)
using namespace std; void solve();
using ll = long long; template<class T = ll> using V = vector<T>;
using vi = V<int>; using vl = V<>; using vvi = V< V<int> >;
constexpr int inf = 1001001001; constexpr ll infLL = (1LL << 61) - 1;
struct IoSetupNya {IoSetupNya() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); cerr << fixed << setprecision(7);} } iosetupnya;
template<typename T, typename U> inline bool amin(T &x, U y) { return (y < x) ? (x = y, true) : false; }
template<typename T, typename U> inline bool amax(T &x, U y) { return (x < y) ? (x = y, true) : false; }
template<typename T, typename U> ostream& operator <<(ostream& os, const pair<T, U> &p) { os << p.first << " " << p.second; return os; }
template<typename T, typename U> istream& operator >>(istream& is, pair<T, U> &p) { is >> p.first >> p.second; return is; }
template<typename T> ostream& operator <<(ostream& os, const vector<T> &v) { int s = (int)v.size(); rep(i,s) os << (i ? " " : "") << v[i]; return os; }
template<typename T> istream& operator >>(istream& is, vector<T> &v) { for(auto &x : v) is >> x; return is; }
void in(){} template <typename T,class... U> void in(T &t,U &...u){ cin >> t; in(u...);}
void out(){cout << "\n";} template <typename T,class... U> void out(const T &t,const U &...u){ cout << t; if(sizeof...(u)) cout << " "; out(u...);}
template<typename T>void die(T x){out(x); exit(0);}
#ifdef NyaanDebug
  #include "NyaanDebug.h"
  #define trc(...) do { cerr << #__VA_ARGS__ << " = "; dbg_out(__VA_ARGS__);} while(0)
  #define trca(v,N) do { cerr << #v << " = "; array_out(v , N);} while(0)
  #define trcc(v) do { cerr << "name : " << #v << "\n"; int cnt = 0; each(x , v){cerr << (cnt++) << " : "; trc(x); } } while(0)
#else
  #define trc(...)
  #define trca(...)
  #define trcc(...)
  int main(){solve();}
#endif

#define inc(...) char __VA_ARGS__; in(__VA_ARGS__)
#define in2(s,t)   rep(i,sz(s)){in(s[i] , t[i]);}
#define in3(s,t,u) rep(i,sz(s)){in(s[i] , t[i] , u[i]);}
using vd = V<double>; using vs = V<string>; using vvl = V< V<> >;
template<typename T,typename U>ll ceil(T a,U b){return (a + b - 1) / b;}

using P = pair<int,int>; using vp = V<P>;
constexpr int MOD = /**/ 1000000007; //*/ 998244353;
//////////////////

template< typename T >
struct edge {
  int src, to;
  T cost;

  edge(int to, T cost) : src(-1), to(to), cost(cost) {}
  edge(int src, int to, T cost) : src(src), to(to), cost(cost) {}

  edge &operator=(const int &x) { // edge e = n; とできる(e.to = n)
    to = x;
    return *this;
  }

  // int()をオーバーロードすることで重み付きグラフと普通のグラフでライブラリを共用できる
  operator int() const { return to; } // v[e]とできる ( v[e.to]に同じ )

};

// sort用 とりあえずcostの小さいほうが左としているが適宜書き換えて使いましょう
/**
template<typename T>
bool operator <(const edge<T>& e1,const edge<T>& e2){ 
  return e1.cost < e2.cost;
}//*/
template< typename T >
using Edges = vector< edge< T > >;
template< typename T >
using WeightedGraph = vector< Edges< T > >;
using UnweightedGraph = vector< vector <int> >;

vp nyaan;

// グラフの入力
UnweightedGraph graph(int N , int M = -1 ,bool is_1origin = true){
  UnweightedGraph g(N);
  if(M == -1) M = N - 1;
  for(int _ = 0 ; _ < M ; _++){
    int x , y; cin >> x >> y;
    if(is_1origin) x-- , y--;
    g[x].pb(y); g[y].pb(x);
    nyaan.eb(x , y);
  }
  return g;
}

// 重み付きグラフの入力
template<typename T>
WeightedGraph<T> wgraph(int N , int M = -1 ,bool is_1origin = true){
  WeightedGraph<T> g(N);
  if(M == -1) M = N - 1;
  for(int _ = 0 ; _ < M ; _++){
    int x , y; cin >> x >> y;
    T c; cin >> c;
    if(is_1origin) x-- , y--;
    g[x].eb(y , c);
    g[y].eb(x , c);
  }
  return g;
}

void solve(){
  ini(N , K);
  auto g = graph(N);
  
  auto dfs = [&](auto rec,int cur,int par,int rest) -> int{
    int ret = 1;
    if(rest == 0) return ret;
    each(dst , g[cur]){
      if(dst == par) continue;
      ret += rec(rec , dst , cur , rest - 1);
    }
    return ret;
  };
  trc(dfs(dfs , 0 , -1 , K));
  trc(dfs(dfs , 0 , -1 , 1));

  if(K % 2 == 0)
  {
    int nokosu = 0;
    rep(i , N){
      amax(nokosu , dfs(dfs , i , -1 , K / 2));
    }
    out(N - nokosu);
  }
  else{
    int nokosu = 0;
    each(e , nyaan){
      int cur = 0;
      cur += dfs(dfs , e.first , e.second , K / 2);
      cur += dfs(dfs , e.second, e.first  , K / 2);
      amax(nokosu , cur);
    }
    out(N - nokosu);
  }

}

Measured memory_bytes: 384