#define _CRT_SECURE_NO_WARNINGS
#include <string>
#include <vector>
#include <algorithm>
#include <numeric>
#include <set>
#include <map>
#include <queue>
#include <iostream>
#include <sstream>
#include <cstdio>
#include <cmath>
#include <ctime>
#include <cstring>
#include <cctype>
#include <cassert>
#include <limits>
#include <functional>
#define rep(i,n) for(int (i)=0;(i)<(int)(n);++(i))
#define rer(i,l,u) for(int (i)=(int)(l);(i)<=(int)(u);++(i))
#define reu(i,l,u) for(int (i)=(int)(l);(i)<(int)(u);++(i))
#if defined(_MSC_VER) || __cplusplus > 199711L
#define aut(r,v) auto r = (v)
#else
#define aut(r,v) typeof(v) r = (v)
#endif
#define each(it,o) for(aut(it, (o).begin()); it != (o).end(); ++ it)
#define all(o) (o).begin(), (o).end()
#define pb(x) push_back(x)
#define mp(x,y) make_pair((x),(y))
#define mset(m,v) memset(m,v,sizeof(m))
#define INF 0x3f3f3f3f
#define INFL 0x3f3f3f3f3f3f3f3fLL
using namespace std;
typedef vector<int> vi; typedef pair<int,int> pii; typedef vector<pair<int,int> > vpii;
typedef long long ll; typedef vector<long long> vl; typedef pair<long long,long long> pll; typedef vector<pair<long long,long long> > vpll;
typedef vector<string> vs; typedef long double ld;
template<typename T, typename U> inline void amin(T &x, U y) { if(y < x) x = y; }
template<typename T, typename U> inline void amax(T &x, U y) { if(x < y) x = y; }

template<typename T>T gcd(T x, T y){if(y==0)return x;else return gcd(y,x%y);}
template<typename T>T lcm(T x, T y){ return x == 0 ? y : x/gcd(x,y)*y; }

int main() {
	int N, K;
	scanf("%d", &N);
	scanf("%d", &K);
	vector<int> a(N);
	rep(i, N) a[i] = i;
	rep(i, K) {
		int X, Y;
		scanf("%d%d", &X, &Y), -- X, -- Y;
		swap(a[X], a[Y]);
	}
	long long ans = 1;
	vector<bool> vis(N);
	rep(i, N) if(!vis[i]) {
		int j = i, len = 0;
		do {
			vis[j] = true;
			++ len;
			j = a[j];
		}while(j != i);
		ans = lcm(ans, (long long)len);
	}
	printf("%lld\n", ans);
	return 0;
}