// https://www.acmicpc.net/problem/1823

// 수확 다이나믹

public static void main(String[] args) throws IOException {

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

StringTokenizer st = new StringTokenizer(br.readLine());

int N = Integer.parseInt(st.nextToken());

int[] arr = new int[N + 1];

for (int i = 1; i <= N; i++) {

arr[i] = Integer.parseInt(br.readLine());

}

int[][] dynamic = new int[N + 1][N + 1];

int[] sum = new int[N + 1];

for (int i = 1; i <= N; i++) {

dynamic[i][i] = arr[i];

}

sum[1] = arr[1];

for (int i = 2; i <= N; i++) {

sum[i] = sum[i - 1] + arr[i];

}

for (int i = 1; i < N ; i++) {

for (int j = 1; j <= N - i; j++) {

dynamic[j][j + i] = Math.max(dynamic[j + 1][j + i], dynamic[j][j + i - 1]) + (sum[j + i] - sum[j - 1]);

}

}

System.out.println(dynamic[1][N]);

}

}