/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc = new Scanner(System.in);
		
		int N = sc.nextInt();
		int E = sc.nextInt();
		
		ArrayList<ArrayList<Integer>> ls = new ArrayList<>();
		
		for(int i = 0; i <= N; i++) ls.add(new ArrayList<>());
		
		for(int i = 0; i < E; i++){
			int u = sc.nextInt();
			int v = sc.nextInt();
			ls.get(u).add(v);
			ls.get(v).add(u);
		}
		
		// red = 1 and green = 2
		
		int red = 1;
		int green = 0;
		
		Queue<Integer> q = new LinkedList<>();
		
		int[] used = new int[N + 1];
		
		Arrays.fill(used, 0);
		
		used[1] = 1;
		
		q.add(1);
		
		int ans = 1;
		
		while(!q.isEmpty()){
			int node = q.poll();
			
			for(int child : ls.get(node)){
				if(used[child] == 0){
					if(used[node] == 1){
						used[child] = 2;
					}
					if(used[node] == 2){
						used[child] = 1;
					}
					q.add(child);
					
				}else{
					if(used[node] + used[child] == 3){
						
					}else{
						ans = 0;
					}
				}
			}
		}
		
		System.out.print(ans);
	}
}