#include <iostream>
#include <vector>
using namespace std;

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

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

int calc_cycle(int elt, vector<int>& perm, vector<bool>& used) {
    used[elt] = true;
    int next = perm[elt];
    if (used[next]) return 1;
    else return calc_cycle(next, perm, used) + 1;
}

int main() {
    int n, k;
    cin >> n;

    vector<int> perm(n);
    vector<bool> used(n, false);
    for (int i = 0; i < n; i++) {
        perm[i] = i;
    }
    cin >> k;
    for (int i = 0; i < k; i++) {
        int x, y;
        cin >> x >> y;
        swap(perm[x - 1], perm[y - 1]);
    }
    vector<int> cycles;
    for (int i = 0; i < n; i++) {
        if (!used[i]) {
            cycles.push_back(calc_cycle(i, perm, used));
        }
    }

    int ans = 1;
    for (auto cycle : cycles) {
        ans = lcm(ans, cycle);
    }
    cout << ans << endl;

    return 0;
}