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

int N, M;
vector<int> P, Q;

void Solve() {
    int cup[3] = {};
    cup[N - 1] = 1;

    for (int i = 0; i < M; i++) {
        swap(cup[P[i] - 1], cup[Q[i] - 1]);
    }
    for (int i = 0; i< 3; i++) {
        if (cup[i]) {
            cout << i + 1 << endl;
            return;
        }
    }
}

int main() {
    cin >> N >> M;

    P = vector<int>(M);
    Q = vector<int>(M);

    for (int i = 0; i < M; i++) {
        cin >> P[i] >> Q[i];
    }

    Solve();
    
    return 0;
}