#include "bits/stdc++.h"
using namespace std;
#ifdef _DEBUG
#include "dump.hpp"
#else
#define dump(...)
#endif

//#define int long long
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define all(c) begin(c),end(c)
const int INF = sizeof(int) == sizeof(long long) ? 0x3f3f3f3f3f3f3f3fLL : 0x3f3f3f3f;
const int MOD = 1'000'000'007;
template<class T> bool chmax(T &a, const T &b) { if (a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, const T &b) { if (b < a) { a = b; return true; } return false; }

int gcd(int x, int y) { return y ? gcd(y, x % y) : x; }
int lcm(int x, int y) { return x / gcd(x, y) * y; }

signed main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	int N, K; cin >> N >> K;
	vector<int> X(K), Y(K); rep(i, 0, K) {
		cin >> X[i] >> Y[i];
		X[i]--, Y[i]--;
	}
	vector<int> v(N); iota(all(v), 0);
	rep(i, 0, K)
		swap(v[X[i]], v[Y[i]]);
	int l = 1;
	rep(i, 0, N) {
		int c = 1;
		for (int s = v[i]; s != i; s = v[s]) {
			c++;
		}
		dump(c);
		l = lcm(l, c);
	}
	cout << l << endl;
	return 0;
}