#include <bits/stdc++.h>

using namespace std;

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

    vector<int> a(4, 0);
    a[n] = 1;
    for (int i = 0; i < m; ++i) {
        int p, q;
        cin >> p >> q;
        swap(a[p], a[q]);
    }

    for (int i = 0; i < 4; ++i) {
        if (a[i] == 1) {
            cout << i << endl;
            return 0;
        }
    }
}