/* -*- coding: utf-8 -*-
 *
 * 123.cc: No.123 カードシャッフル - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 50;

/* typedef */

/* global variables */

int cs[MAX_N];

/* subroutines */

/* main */

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

  for (int i = 0; i < n; i++) cs[i] = i + 1;
  
  while (m--) {
    int ai;
    cin >> ai;
    ai--;

    int c = cs[ai];
    for (int i = ai - 1; i > 0; i--) cs[i] = cs[i - 1];
    cs[0] = c;
  }

  printf("%d\n", cs[0]);
  return 0;
}