#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 100000000000


int main(){
	
	int N;
	cin>>N;
	
	vector<int> a(N);
	rep(i,N)a[i] = i;
	
	int K;
	cin>>K;
	
	rep(i,K){
		int x,y;
		cin>>x>>y;
		swap(a[x],a[x-1]);
	}
	
	dsu D(N);
	rep(i,N){
		D.merge(i,a[i]);
	}
	
	long long ans = 1LL;
	
	rep(i,N){
		ans = lcm(ans,(long long)D.size(i));
	}
	
	cout<<ans<<endl;
	
	return 0;
}