//Normal

#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void print(auto a){
  cout << a;
}

void prints(auto a){
  cout << a << " ";
}

void prints(){
  cout << " ";
}

void printl(auto a){
  cout << a << endl;
}

void printl(){
  cout << endl;
}

void fix(int n){
  cout << fixed << setprecision(n);
}

int main(){
  int N, M; cin >> N >> M;
  vector<int> X(N);
  for(int i = 0; i < N; i++) X[i] = i+1;
  
  for(int i = 0; i < M; i++){
    int A; cin >> A;
    int a = X[A-1];
    
    for(int j = A-1; j > 0; j--){
      X[j] = X[j-1];
    }
    
    X[0] = a;
  }
  
  printl(X[0]);
  
  return 0;
}