import java.io.*; import java.util.*; class Main { public static void main(String args[])throws Exception { BufferedReader bu=new BufferedReader(new InputStreamReader(System.in)); StringBuilder sb=new StringBuilder(); String s[]=bu.readLine().split(" "); int n=Integer.parseInt(s[0]),k=Integer.parseInt(s[1]); int t[][]=new int[k][2],i; for(i=0;i