Lamp.java

import java.util.*;

public class Lamps {

    public static void main(String[] args) throws Exception {
        Scanner scan = new Scanner(System.in);

        String s = scan.nextLine();
        String[] sArray = s.split(" ");
        int[] lampa = new int[sArray.length];

        for (int i = 0; i < sArray.length; i++) {
            lampa[i] = Integer.valueOf(sArray[i]);
        }

        System.out.println(solve(lampa));

    }

    public static int solve(int[] pole) {

        int x = 0;
        int n = pole.length;
        if (n > 5) {
            int m = n / 2;

            int a = solve(Arrays.copyOfRange(pole, 0, (m)));
            int b = solve(Arrays.copyOfRange(pole, m, (n)));
            int c = solve(Arrays.copyOfRange(pole, 0, (m - 1)));
            int d = solve(Arrays.copyOfRange(pole, (m + 1), (n)));

            x = Math.min((a + b), Math.min((c + b), (a + d)));
        } else if (n == 5) {
            x = Math.min(pole[2], (pole[1] + pole[3])) + pole[0] + pole[4];
        } else if (n == 4) {
            x = Math.min(pole[1], pole[2]) + pole[0] + pole[3];
        } else if (n == 3) {
            x = pole[0] + pole[pole.length - 1];
        } else if (n == 2) {
            x = pole[0] + pole[pole.length - 1];
        } else if (n < 2) {
            x = pole[0];
        }

        return x;
    }

}