import java.io.*;
public class Rentang {
 Rentang() {
 try {
 BufferedReader br = new BufferedReader (
 new InputStreamReader(System.in));
String par[] = br.readLine().split(" ");
int N = Integer.parseInt(par[0]);
int k = Integer.parseInt(par[1]);
int newSeq = 0;
int minSeq = 0;
for (int i = 0; i < N; i++) {
 int x = Integer.parseInt(br.readLine());
    newSeq += x;
    if (newSeq < minSeq) {
        minSeq = newSeq;
    } else if (newSeq > 0) {
        newSeq = 0;
    }
 }
 // bagian mencetak k terbesar
 }
 catch (Exception e) { System.out.println(e); }
}
public static void main(String[] args) {
 new Rentang();
 }
}