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

int main() {
  int N, M;
  cin >> N >> M;
  vector<int> V(N);
  for (int i = 0; i < N; i++) V.at(i) = i + 1;
  while (cin >> M) {
    int tmp = V.at(M - 1);
    V.erase(V.begin() + M - 1);
    V.insert(V.begin(), tmp);
  }
  cout << V.at(0) << "\n";
}