import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int N = sc.nextInt();
int t = sc.nextInt();
int s = t;
if(t < 0) {
t = 0;
}
for(int i = 1; i < N; i++) {
t += sc.nextInt();
s = Math.max(s, t);
if(t < 0) {
t = 0;
}
}
System.out.println(s);
}
}