#include<cstdio>
#include <iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>

using namespace std;
typedef long long ll;
typedef pair<int, int> Pr;

int N, M;
int A[51];

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