import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int k = sc.nextInt();
    int[] sig = new int[n];
    for(int i = 0; i < n; i++) {
      sig[i] = i;
    }
    for(int i = 0; i < k; i++) {
      int x = sc.nextInt() - 1;
      int y = sc.nextInt() - 1;
      sig[x] = sig[y];
      sig[y] = sig[x];
    }
    int[] sig2 = new int[n];
    for(int i = 0; i < n; i++) {
      sig2[sig[i]] = i;
    }
    int[] b = new int[n];
    for(int i = 0; i < n; i++) {
      int t = 1;
      int p = sig2[i];
      while(sig2[p] != i) {
        t++;
        p = sig2[p];
      }
      b[i] = t;
    }
    long lcm = 1;
    for(int i = 0; i < n; i++) {
      long g = gcd(lcm, (long)b[i]);
      lcm = g * (lcm / g) * ((long)b[i] / g);
    }
    System.out.println(lcm);
  }

  public static long gcd(long a, long b) {
    if(b == 0) return a;
    return gcd(b, (a % b));
  }
}