#include <iostream>
#include <cstdio>
#include <algorithm>
#include <string>
#include <cstring>
#include <cctype>
#include <cmath>
#include <stack>
#include <queue>
#include <vector>
#include <set>
#include <map>
#include <list>
#include <stdio.h>
#include <string.h>
#include <cstdlib>
#include <math.h>
#include <bitset>
#include <iterator>
#include <iomanip>
#include <sstream>
#include <numeric>
#define INF 2000000000
using namespace std;
int dx[4]={1,0,-1,0},dy[4]={0,1,0,-1};
#define sym cout<<"---------"<<endl;
#define ll long long
#define PL pair<long long, long long>
#define P pair<int,int>
#define mk make_pair
#define en endl
#define WHITE 0
#define BLACK 2
#define GRAY 1
#define RE return 0
#define int ll

int a[55];

signed main(){
  int n,m;
  cin>>n>>m;
  
  for(int i=1; i<=n; i++) a[i]=i;
  for(int i=0; i<m; i++){
    int where;
    cin>>where;
    int top=a[where];
    for(int j=where; j>=2; j--) a[j]=a[j-1];
    a[1]=top;
  }
  cout<<a[1]<<en;
}