

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();
		int a[] = new int[N];
		for (int i = 0; i < N; i++) {
			a[i] = sc.nextInt();
		}
		int max = 0;
		for (int i = 0; i < N; i++) {
			if (a[i] != 0) {
				max += a[i] - 1;
			}
		}
		System.out.println(max);
	}
}
