# include <iostream>
# include <algorithm>
# include <vector>
# include <string>
# include <set>
# include <map>
# include <cmath>
# include <iomanip>
# include <functional>
# include <utility>
# include <stack>
# include <queue>
# include <list>
# include <tuple>
# include <unordered_map>
# include <numeric>
# include <complex>
# include <bitset>
# include <random>
# include <chrono>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
constexpr int INF = 2147483647;
constexpr int HINF = INF / 2;
constexpr double DINF = 100000000000000000.0;
constexpr double HDINF = 50000000000000000.0;
constexpr long long LINF = 9223372036854775807;
constexpr long long HLINF = 4500000000000000000;
const double PI = acos(-1);
int dx[4] = { 0,1,0,-1 }, dy[4] = { 1,0,-1,0 };
template <typename T_char>T_char TL(T_char cX) { return tolower(cX); };
template <typename T_char>T_char TU(T_char cX) { return toupper(cX); };
# define ALL(x)      (x).begin(),(x).end()
# define UNIQ(c)     (c).erase(unique(ALL((c))),(c).end())
# define LOWER(s)    transform(ALL((s)),(s).begin(),TL<char>)
# define UPPER(s)    transform(ALL((s)),(s).begin(),TU<char>)
# define mp          make_pair
# define eb          emplace_back
# define FOR(i,a,b)  for(LL i=(a);i<(b);i++)
# define RFOR(i,a,b) for(LL i=(a);i>=(b);i--)
# define REP(i,n)    FOR(i,0,n)
# define INIT        std::ios::sync_with_stdio(false);std::cin.tie(0)

int n;
int k;
int swapper[1010];
int x[1010], y[1010];
LL ans = 1;

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

long long lcm(long long a, long long b) {
	long long g = gcd(a, b);
	return a / g * b;
}

int main() {
	cin >> n >> k;
	REP(i, k) {
		cin >> x[i] >> y[i];
		x[i]--, y[i]--;
	}
	REP(i, n)swapper[i] = i;
	REP(i, k) {
		swap(swapper[x[i]], swapper[y[i]]);
	}
	REP(i, n) {
		int pos = i;
		int cnt = 0;
		do {
			cnt++;
			pos = swapper[pos];
		} while (pos != i);
		ans = lcm(ans, cnt);
	}
	cout << ans << endl;
}