#include <iostream>
#include <vector>
#include <algorithm>

#define REP(i, a, b) for (int i = int(a); i < int(b); i++)

using namespace std;

typedef long long int lli;

int main() {
    int N, M;
    cin >> N >> M;
    vector<int> v(N);
    REP (i, 0, N) v[i] = i;
    REP (i, 0, M) {
        int A;
        cin >> A;
        A--;
        int target = v[A];
        for (int k = A; k > 0; k--) {
            v[k] = v[k - 1];
        }
        v[0] = target;
    }
    cout << v[0] + 1 << endl;
    return 0;
}