#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <map>
#include <list>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <iomanip>
#define INF 1050000000

using namespace std;

int main(void)
{
	int n, m;
	int x[50];
	int a, o;

	cin >> n >> m;

	for (int i = 1; i <= n; i++) {
		x[i] = i;

	}

	for (int i = 0; i < m; i++) {
		cin >> a;
		o = x[a];
		for (int j = a - 1; j >= 1; j--) {
			x[j + 1] = x[j];
		}
		x[1] = o;
	}

	cout << x[1] << endl;

}