#include "iostream"
using namespace std;

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

    while (m--){
        cin>>p>>q;
        if (n == p){
            n = p;
        } else if (n==q) {
            n = q;
        }
    }
    cout<<n<<endl;
    return 0;
}