// yukicoder: No.101 ぐるぐる！あみだくじ！
// 2019.8.7 bal4u

#include <stdio.h>

#if 1
#define gc() getchar_unlocked()
#else
#define gc() getchar()
#endif

int in() {   // 非負整数の入力
	int n = 0, c = gc();
	do n = 10 * n + (c & 0xf); while ((c = gc()) >= '0');
	return n;
}

int gcd(int a, int b) {	int r; while (b != 0) r = a % b, a = b, b = r; return a; }
int lcm(int a, int b) {	return a/gcd(a, b)*b; }

int N, K;
int x[1002], y[1002];
int t[102];
int a[102];
	
int main()
{
	int i, j, k, n, ans;

	N = n = in(), K = in();
	for (i = 0; i < K; i++) x[i] = in()-1, y[i] = in()-1;
	for (i = 0; i < N; i++) a[i] = i;
	j = 1; while (n) {
		for (i = 0; i < K; i++) k= a[x[i]], a[x[i]] = a[y[i]], a[y[i]] = k;
		for (i = 0; i < N; i++) if (a[i] == i && t[i] == 0) t[i] = j, n--;
		j++;
	}

	ans = 1;
	for (i = 0; i < N; i++) ans = lcm(ans, t[i]);
	printf("%d\n", ans);
	return 0;
}