import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int n = sc.nextInt();
		StringBuilder sb = new StringBuilder();
		for (int i=1; i<=n; i++) {
			if (i < 10) {sb.append("0");}
			sb.append(i);
		}
		
		int m = sc.nextInt();
		for (int i=0; i<m; i++) {
			int end = sc.nextInt()*2;
			int start = end - 2;
			sb.insert(0,sb.substring(start,end));
			sb.delete(start+2,end+2);
		}
		
		int ans = Integer.parseInt(sb.substring(0,2));
		
		System.out.println(ans);
	}
}