#include <bits/stdc++.h>
#define f first
#define s second
#define mp make_pair
#define pb push_back
#define p push
#define ins insert
#define t top
#define fr front
#define T1 10
#define T2 100
#define T3 1000
#define T4 10000
#define T5 100000
#define T6 1000000
#define H1 11
#define H2 105
#define H3 1010
#define H4 10010
#define H5 100010
#define H6 1000010
#define H 4*H2
#define HH 43
#define woof 31051
#define mod 998244353
#define MOD 1000000007
#define lnf 0
#define inf 1069999999
#define INF 2099999999
#define LNF 1e18
// sacrilege
#define F0(x,n) for(int x = 0; x < n; ++x)
#define FR0(x,L,R) for(int x = L; x < R; ++x)
#define R0(x,n) for(int x = n-1; x >= 0; --x)
#define F1(x,n) for(int x = 1; x <= n; ++x)
#define FR1(x,L,R) for(int x = L; x <= R; ++x)
#define R1(x,n) for(int x = n; x >= 1; --x)
#define RR(x,L,R) for(int x = R; x >= L; --x)
#define FE(x,ls) for(auto x : ls)
#define ub(x,v) upper_bound(x.begin(),x.end(),v)
#define lb(x,v) lower_bound(x.begin(),x.end(),v)
using namespace std;
mt19937 mr(time(0));
typedef long long int ll;
typedef string str;
typedef double dbl;
struct LL {
static const ll m = mod; // set to LNF for nomod
long long int val;
LL(ll v) {val=reduce(v);};
LL(int v) {val=reduce((ll)v);};
LL() {val=0;};
~LL(){};
LL(const LL& l) {val=l.val;};
LL& operator=(int l) {val=l; return *this;}
LL& operator=(ll l) {val=l; return *this;}
LL& operator=(LL l) {val=l.val; return *this;}
static long long int reduce(ll x, ll md = m) {
x %= md;
while (x >= md) x-=md;
while (x < 0) x+=md;
return x;
}
bool operator<(const LL& b) { return val<b.val; }
bool operator<=(const LL& b) { return val<=b.val; }
bool operator!=(const LL& b) { return val!=b.val; }
bool operator==(const LL& b) { return val==b.val; }
bool operator>=(const LL& b) { return val>=b.val; }
bool operator>(const LL& b) { return val>b.val; }
LL operator+(const LL& b) { return LL(val+b.val); }
LL operator+(const ll& b) { return (*this+LL(b)); }
LL& operator+=(const LL& b) { return (*this=*this+b); }
LL& operator+=(const ll& b) { return (*this=*this+b); }
LL operator-(const LL& b) { return LL(val-b.val); }
LL operator-(const ll& b) { return (*this-LL(b)); }
LL& operator-=(const LL& b) { return (*this=*this-b); }
LL& operator-=(const ll& b) { return (*this=*this-b); }
LL operator*(const LL& b) { return LL(val*b.val); }
LL operator*(const ll& b) { return (*this*LL(b)); }
LL& operator*=(const LL& b) { return (*this=*this*b); }
LL& operator*=(const ll& b) { return (*this=*this*b); }
static LL exp(const LL& x, const ll& y){
ll z = y;
z = reduce(z,m-1);
LL ret = 1;
LL w = x;
while (z) {
if (z&1) ret *= w;
z >>= 1; w *= w;
}
return ret;
}
LL& operator^=(ll y) { return (*this=LL(val^y)); }
LL operator/(const LL& b) { return ((*this)*exp(b,-1)); }
LL operator/(const ll& b) { return (*this/LL(b)); }
LL operator/=(const LL& b) { return ((*this)*=exp(b,-1)); }
LL& operator/=(const ll& b) { return (*this=*this/LL(b)); }
}; ostream& operator<<(ostream& os, const LL& obj) { return os << obj.val; }
typedef pair<int,int> pii;
typedef pair<int,ll> pil;
typedef pair<int,LL> piL;
typedef pair<ll,ll> pll;
typedef pair<LL,LL> pLL;
typedef pair<dbl,dbl> pdd;
using namespace std;
ll cases,N,M,Q,K,X,Y;
ll rd() {ll x;cin>>x; return x;}
dbl rdd() {dbl x;cin>>x; return x;}
void fl() {cout.flush();}
void panic(ll out) {
cout << out << endl;
exit(0);
}
void panic(str out) {
cout << out << endl;
exit(0);
}
vector<int> adj[H];
int T[H]; int D[H]; int t = 0;
vector<int> L;
vector<pii> dual[H];
vector<pii> edges[21];
void dfs(int v, int d=-1) {
D[v] = ++d; T[v]=++t;
if (d==K) L.pb(T[v]);
else FE(u,adj[v]) if (T[u]==0) dfs(u,d);
if (d) dual[L.back()].pb(mp(*--lb(L,T[v]),d-1));
}
bool DP[H][H6+H5];
void read() {
N=rd();K=rd();
F0(i,N-1) {
int a=rd(); int b=rd();
adj[a].pb(b);
adj[b].pb(a);
}
if (K*K>N) panic("DA");
L.pb(0);
dfs(1);
F0(i,H)F0(j,H6+H5)DP[i][j]=0;DP[0][0]=1;
FE(v,L) F0(b,1<<K) FE(e,dual[v]) {
if ((1<<e.s)&b) DP[v][b]|=DP[e.f][b^(1<<e.s)];
}
cout << (DP[L.back()][(1<<K)-1]?"DA":"NE") << endl;
}
int main() {
bool trials = 0;
bool interactive = 0;
if (!interactive) {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
}
if (trials) cases=rd();
else cases=1;
while (cases--) {
read();
}
}
