#include <iostream>
using namespace std;

int main()
{
    int n,m,p[200],q[200];
    cin >> n >> m;

    for(int i = 0; i < m; i++){
        cin >> p[i] >> q[i];
        if(p[i] == n) n = q[i];
        else if(q[i] == n) n = p[i];
    }

    cout << n << endl;

    return 0;
}