#include <iostream>
using namespace std;
typedef long long ll;

ll gcd(ll a, ll b){
	if(b == 0)return a;
	return gcd(b, a % b);
}

ll lcm(ll a, ll b){
	return a / gcd(a, b) * b;
}

int N, K;
int nxt[55];

bool used[55];
int dfs(int now){
	if(used[now])return 0;
	used[now] = true;
	return 1 + dfs(nxt[now]);
}

ll solve(){
	ll res = 1;
	for(int i=0;i<N;i++)if(!used[i]){
		res = lcm(res, dfs(i));
	}
	return res;
}

int main() {
	cin >> N >> K;
	for(int i=0;i<N;i++)nxt[i] = i;
	for(int i=0;i<K;i++){
		int X, Y;
		cin >> X >> Y;

		--X;
		--Y;

		swap(nxt[X], nxt[Y]);
	}

	cout << solve() << endl;	
	return 0;
}