#include "bits/stdc++.h"
using namespace std;

int main() {
    int N,M,temp;
    cin >> N >> M;
    int A[M];
    int B[N];
    int temp1[N];

    for(int i = 0; i < M; i++)
    {
        cin >> A[i];
    }
    
    for(int i = 0; i < N; i++)
    {
        B[i] = i+1;
    }

    for(int i = 0; i < M; i++)
    {
        temp = B[A[i]-1];
        temp1[0] = B[0];
        for(int k = 0; k < A[i]-1; k++){
            temp1[k+1] = B[k+1];
            B[k+1] = temp1[k];      
        }
        B[0] = temp;
    }
    
    cout << B[0] << endl;
    return 0;
}