#include 
     
      using namespace std;#define INF 0x3f3f3f3f#define MAXN 1000010#define MAXM 5010inline int read(){    int x =  0,ff = 1;char ch = getchar();    while(!isdigit(ch))    {        if(ch == '-') ff = -1;        ch = getchar();    }    while(isdigit(ch))    {        x = (x << 1) + (x << 3) + (ch ^ 48);        ch = getchar();    }    return x * ff;}int n,m,ti = 0,dfn[MAXN],low[MAXN],cut[MAXN];int lin[MAXN],tot = 0;struct edge{    int y,next;}e[MAXN];inline void add(int xx,int yy){    e[++tot].y = yy;    e[tot].next = lin[xx];    lin[xx] = tot;}void Tarjan(int x){    dfn[x] = low[x] = ++ti;    int son = 0;    for(int i = lin[x],y;i;i = e[i].next)    {        if(!dfn[y = e[i].y])        {            Tarjan(y);            low[x] = min(low[x],low[y]);            if(low[y] >= dfn[x])             {                son++;                if(x ^ 1 || son >= 2) cut[x] = true;            }         }        else low[x] = min(low[x],dfn[y]);    }}int main(){    n = read(); m = read();    for(int i = 1;i <= m;++i)    {        int x,y;        x = read(); y = read();        add(x,y); add(y,x);    }    Tarjan(1);    system("PAUSE");    return 0;}