#include "bits/stdc++.h"
using namespace std;

#define REP(i, n) for(int i=0; i<(n); i++)
int gcd(int a, int b) { if (!b) return a; return gcd(b, a%b); }

int N,K;
signed main()
{
    cin >> N>>K;
    vector<int> amida(N);
    REP(i,N) amida[i] = i;
    vector<int> x(K);
    int y;
    REP(i,K) {
        cin >> x[i] >> y;
        swap(amida[x[i]-1], amida[x[i]]);
    }
    int cnt = 0;
    vector<int> tmp(N);
    vector<int> loop(N, 0);
    REP(i,N) tmp[i] = i;
    while(true) {
        cnt++;
        vector<int> tmp2(N);
        REP(i,N) {
            tmp2[i] = tmp[amida[i]];
        }
        bool isok = true;
        REP(i,N) {
            if (loop[i] == 0 && tmp2[i] == i) {
                loop[i] = cnt;
            }
            if (loop[i] == 0) isok = false;
        }
        if (isok) break;
        tmp = tmp2;
    }
    // 最小公倍数を求める
    int lcmc = 1;
    REP(i,N) {
        int g = gcd(lcmc, loop[i]);
        lcmc = lcmc * loop[i] / g;
    }
    cout << lcmc << endl;
    return 0;
}