#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

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

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

    cout << ans << endl;

    return 0;
}