import java.util.Scanner;
public class bj16194 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int N, i, j;
int P[];
int dp[];
N = scanner.nextInt();
P = new int[N + 1];
dp = new int[N + 1];
for (i = 1; i <= N; i++) {
P[i] = scanner.nextInt();
}
for (i = 1; i <= N; i++)
{
dp[i] = P[i];
for(j = 1; j <= i; j++)
{
dp[i] = Math.min(dp[i], dp[i - j] + P[j]);
}
}
System.out.println(dp[N]);
scanner.close();
}
}