#include <bits/stdc++.h>
using namespace std;

int main(){
    int N, M, tmp, i;
    vector <int> sfl, card;

    cin >> N >> M;
    for(i = 0; i < M; i++){
        cin >> tmp;
        sfl.push_back(tmp);
    }
    for(i = 0; i < 50; i++){
        card.push_back(i + 1);
    }
    for(i = 0; i < M; i++){
        tmp = card[sfl[i] - 1];
        card.erase(card.begin() + sfl[i] - 1);
        card.insert(card.begin(), tmp);
    }

    cout << card[0] << endl;

    return 0;
}