#include <bits/stdc++.h>
#define PI 3.14159265359
#define MAX 10000
#define NIL -1
using namespace std;
const int64_t MOD = 1e9 + 7;

int main() {
	int N, M;
	cin >> N >> M;

	vector<int> v(N);
	for (int i = 0; i < N; i++) {
		v.at(i) = i + 1;
	}

	for (int i = 0; i < M; i++) {
		int A;
		cin >> A;

		int n = v.at(A - 1);
		if (A > 1) {
			for (int j = A - 1; j > 0; j--) {
				v.at(j) = v.at(j - 1);
			}
		}
		v.at(0) = n;
	}

	cout << v.at(0) << endl;
}