#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>
#include <iterator>

typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;





int main()
{

    int Q;
    Q = 1;
    //cin >> Q;


    while (Q--) {
        
        int n;
        int m;
        cin >> n >> m;
        vector<int>p(n + 2);
        for (int i = 1; i <= n; i++)p[i] = i;
        for (int i = 0; i < m; i++) {
            int x;
            cin >> x;
            int t = p[x];
            for (int j = x; j > 1; j--) {
                p[j] = p[j - 1];
            }
            p[1] = t;
            

        }
        cout << p[1];
    }
    return 0;
}