#pragma GCC optimize("O3,unroll-loops,Ofast")
// #pragma GCC target("avx2")
#include<bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
// #define int long long
#define endl '\n'

using namespace std;
using pii = pair<int, int>;
using tup = tuple<int, int, int>;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
// template <class T> using ordered_set = tree<T, null_type,
//                          less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;

const int inf = 1e9;
const int mod = 1000000007;
const double eps = 1e-9;
const int N = 500005;

void preprocess() {}

vector<int> e[N];
int sz[N], mx[N];

void dfs(int u, int p) {
    sz[u] = 1;
    mx[u] = 1;
    for(int v : e[u]) if(v != p) {
        dfs(v, u);
        sz[u] += sz[v];
        mx[u] = max(mx[v] + 1, mx[u]);
    }
}

int dp[N][105];

int DP(int i, int k, int p) {
    if(dp[i][k] != -1) return dp[i][k];
    multiset<int, greater<int>> st;
    for(int j : e[i]) if(j - p) 
        st.insert(mx[j]);

    int ans = 1;
    for(int j : e[i]) if(j - p) {
        st.erase(st.find(mx[j]));
        ans = max(ans, 1 + DP(j, k, i));
        if(st.size()) {
            // for(int kk=0; kk<=k; kk++) {
            //     int now = 1 + DP(j, kk, i);
            //     now += min(*st.rbegin(), k - kk);

            //     ans = max(ans, now);
            // } 
            int mxnow = *st.begin();
            int lo = 0, hi = k;
            while(hi - lo > 2) {
                int m1 = lo + (hi - lo) / 3;
                int m2 = hi - (hi - lo) / 3;

                int f1 = 1 + DP(j, m1, i) + min(mxnow, k - m1);
                int f2 = 1 + DP(j, m2, i) + min(mxnow, k - m2);

                if(f1 >= f2) hi = m2;
                else lo = m1;
            }

            int now = 0;
            for(int kk=lo; kk<=hi; kk++) 
                now = max(now, 1 + DP(j, kk, i) + min(mxnow, k - kk));
            ans = max(ans, now);
        }
        st.insert(mx[j]);
    }

    return dp[i][k] = ans;
}

void solve(int tc) {
    int n, k;
    cin >> n >> k;

    for(int i=1; i<n; i++) {
        int u, v;
        cin >> u >> v;
        e[u].push_back(v);
        e[v].push_back(u);
    }

    memset(dp, -1, sizeof dp);
    dfs(1, -1);
    cout << DP(1, k, -1) << endl;
}   

int32_t main() {
    cin.tie(NULL)->sync_with_stdio(false);
    cout.precision(10);

    preprocess();

    int T = 1;
    // cin >> T;

    for (int i = 1; i <= T; i++) {  
        solve(i);
    }

    return 0;
}