import java.util.Scanner;

public class WaterOverflow {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = scanner.nextInt();

        int sum = 0;
        for (int i = 0; i < n; i++) {
            int inputLitres = scanner.nextInt();
            if (inputLitres < (255 - sum)) {
                sum += inputLitres;

            } else {
                System.out.println("Insufficient capacity!");

            }
        }
        System.out.println(sum);
    }
}