// COCI16_burza
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int mod = 1000 * 1000 * 1000 + 7;
const int INF = 1e9 + 100;
const ll LINF = 1e18 + 100;
#ifdef DEBUG
#define dbg(x) cout << #x << " = " << (x) << endl << flush;
#define dbgr(s, f) { cout << #s << ": "; for (auto _ = (s); _ != (f); _++) cout << *_ << ' '; cout << endl << flush; }
#else
#define dbg(x) ;
#define dbgr(s, f) ;
#endif
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define fast_io ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define mp make_pair
#define fr first
#define sc second
#define endl '\n'
#define MAXN 420
#define MAXK 21
int n, k;
vector<int> adj[MAXN];
vector<bool> dp[MAXN];
vector<int> vec[MAXN];
vector<int> leaf;
int h[MAXN];
int sttime[MAXN], fntime[MAXN], timer;
void dfs(int v, int par)
{
sttime[v] = timer;
if (h[v] == k)
{
timer++;
fntime[v] = timer;
vec[fntime[v]].pb(v);
return;
}
for (int u : adj[v])
{
if (u == par) continue;
h[u] = h[v] + 1;
dfs(u, v);
}
fntime[v] = timer;
if (sttime[v] != fntime[v]) vec[fntime[v]].pb(v);
}
int32_t main(void)
{
fast_io;
cin >> n >> k;
FOR(i, 0, n - 1)
{
int x, y;
cin >> x >> y;
adj[x].pb(y);
adj[y].pb(x);
}
if (n <= k * k) return cout << "DA\n", 0;
dfs(1, -1);
FOR(i, 0, n + 5)
dp[i].resize(1 << MAXK);
dbgr(sttime + 1, sttime + n + 1);
dbgr(fntime + 1, fntime + n + 1);
FOR(mask, 0, 1 << k) dp[0][mask] = true;
FOR(i, 1, fntime[1] + 1)
{
FOR(mask, 0, 1 << k)
{
for (int u : vec[i])
{
if (!(mask >> (h[u] - 1) & 1)) continue;
int nmask = mask ^ (1 << (h[u] - 1));
dp[i][mask] = (dp[i][mask] || dp[sttime[u]][nmask]);
}
}
}
if (dp[fntime[1]][(1 << k) - 1]) cout << "DA\n";
else cout << "NE\n";
return 0;
}
