This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#define deb(...) logger(#__VA_ARGS__, __VA_ARGS__)
template<typename ...Args>
void logger(string vars, Args&&... values) {
cerr<<vars<<" = ";
string delim="";
(...,(cerr<<delim<<values,delim=", "));
cerr<<"\n";
}
#else
#define deb(...) logger(#__VA_ARGS__, __VA_ARGS__)
template<typename ...Args>
void logger(string vars, Args&&... values) {}
#endif
#define pb push_back
#define sz(x) (int)(x.size())
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
template<typename T> inline void maxa(T& a,T b){a=max(a,b);}
template<typename T> inline void mina(T& a,T b){a=min(a,b);}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int mxN=1e3+5; //make sure this is right
const int mod=1e9+7;
int adj[mxN][mxN];
struct DSU{
int uf[mxN];
void init(){memset(uf,-1,sizeof(uf));}
int find(int x){return uf[x]<0?x:uf[x]=find(uf[x]);}
bool same(int x,int y){return find(x)==find(y);}
void unite(int x,int y){
x=find(x); y=find(y);
if(x==y)
return;
if(uf[x]>uf[y])
swap(x,y);
uf[x]+=uf[y]; uf[y]=x;
}
} dsu;
int main(){
cin.sync_with_stdio(0);
cin.tie(0); cout.tie(0);
#ifdef LOCAL
freopen("input.txt","r",stdin);
freopen("output.txt","w",stdout);
#endif
dsu.init();
int n,m; cin>>n>>m;
for(int i=0;i<m;i++){
int a,b; cin>>a>>b;
adj[a][b]=1; adj[b][a]=1;
dsu.unite(a,b);
}
set<int> diff;
for(int i=1;i<=n;i++){
for(int j=1;j<=n;j++){
if(i==j)
continue;
if(!adj[i][j] && dsu.same(i,j)){
cout<<"NE\n";
return 0;
}
}
diff.insert(dsu.find(i));
}
if(sz(diff)<=2){
cout<<"DA\n";
} else{
cout<<"NE\n";
}
}
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