/*input
4
2
1 3
2 4
*/
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef tree<long long,null_type,less_equal<long long>,rb_tree_tag,tree_order_statistics_node_update> indexed_set;
#pragma GCC optimize("O2","unroll-loops","no-stack-protector")
//order_of_key #of elements less than x
// find_by_order kth element
using ll=long long;
using ld=long double;
using pii=pair<ld,ld>;
#define f first
#define s second
#define pb push_back
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define FILL(n,x) memset(n,x,sizeof(n))
#define ALL(_a) _a.begin(),_a.end()
#define sz(x) (int)x.size()
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()),c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
const ll INF64=1e18+1;
const int INF=0x3f3f3f3f;
const ll MOD=998244353;
const ld PI=acos(-1);
const ld eps=1e-3;
#define lowb(x) x&(-x)
#define MNTO(x,y) x=min(x,(__typeof__(x))y)
#define MXTO(x,y) x=max(x,(__typeof__(x))y)
inline ll mult(ll a,ll b){
if(a>=MOD) a%=MOD;
if(b>=MOD) b%=MOD;
return (a*b)%MOD;
}
inline ll mypow(ll a,ll b){
if(b<=0) return 1;
ll res=1LL;
while(b){
if(b&1) res=mult(res,a);
a=mult(a,a);
b>>=1;
}
return res;
}
const int maxn=1e3+5;
const int maxlg=__lg(maxn)+2;
vector<int> v[maxn];
bool hv[maxn][maxn];
int col[maxn];
bool die=0;
void dfs(int u){
for(int x:v[u]){
if(col[x]==-1){
col[x]=1-col[u];
dfs(x);
}
else if(col[x]==col[u]){
die=1;
}
}
}
int32_t main(){
ios::sync_with_stdio(false),cin.tie(0);
int n,m;
cin>>n>>m;
REP(i,m){
int a,b;
cin>>a>>b;
--a,--b;
hv[a][b]=hv[b][a]=1;
}
REP(i,n){
REP(j,n){
if(i==j) continue;
if(hv[i][j]) continue;
v[i].pb(j);
}
}
REP(i,n) col[i]=-1;
col[0]=0;
dfs(0);
REP(i,n) if(col[i]==-1 or die){
cout<<"NE";
return 0;
}
cout<<"DA";
}
