#include <iostream>
#include <math.h>
#include <algorithm>
#include <functional>
#include <vector>
#include <typeinfo>
#include <climits>
#include <ctype.h>
#include <string>
using namespace std;
#define INIT cin.tie(0); ios::sync_with_stdio(false);
#define FOR(i, a, n) for (int i = a; i < n; i++)
#define REP(i, n) for(int i = 0; i < n; i++)

int main()
{
    INIT;

    int n, m;
    cin >> n >> m;

    int A[3] = {};
    A[n - 1] = 1;

    REP(i, m){
        int p, q;
        cin >> p >> q;
        int tmp;
        tmp = A[p - 1];
        A[p - 1] = A[q - 1];
        A[q - 1] = tmp;
    }
    REP(i, 3){
        if(A[i] == 1){
            cout << i + 1 << endl;
            break;
        }
    }

    return 0;
}