#include <iostream>
#include <cstdio>
#include <string>
#include <sstream>
#include <algorithm>
#include <math.h>
#include <map>
#include <iomanip>
#include <vector>
#include <queue>
#include <set>
#define PI 3.14159265359
#define INF 99999999;
#define rep(i, n) for(int i=0; i<n; i++)
#define REP(n) rep(i, n)
#define EPS 1e-10
typedef long long ll;
using namespace std;



/*
class Target
{
public:
	vector <string> draw(int n)
	{

	}
};
*/





int main()
{
	int N, M, A, cards[51];
	
	cin >> N >> M;
	for (int i=1; i<=N; i++) cards[i] = i;
	REP(M)
	{
		cin >> A;
		int temp = cards[A];
		for (int j=A; j>=2; j--)
		{
			cards[j] = cards[j-1];
		}
		cards[1] = temp;
	}
	
	cout << cards[1] << endl;
	
	return 0;
}