1 #include <bits/stdc++.h>
2 #define _for(i,a,b) for(int i = (a);i < b;i ++)
3 typedef long long ll;
4 using namespace std;
5 int n;
6 inline ll read()
7 {
8 ll ans = 0;
9 char ch = getchar(), last = ' ';
10 while(!isdigit(ch)) last = ch, ch = getchar();
11 while(isdigit(ch)) ans = (ans << 1) + (ans << 3) + ch - '0', ch = getchar();
12 if(last == '-') ans = -ans;
13 return ans;
14 }
15 inline void write(ll x)
16 {
17 if(x < 0) x = -x, putchar('-');
18 if(x >= 10) write(x / 10);
19 putchar(x % 10 + '0');
20 }
21 int a[200039];
22
23 int main()
24 {
25 n = read();
26 _for(i,0,n)
27 a[i] = read();
28
29 int rnt = a[0];
30 int trnt = a[0];
31 _for(i,1,n)
32 {
33 if(trnt<0)
34 trnt = a[i];
35 else
36 trnt += a[i];
37 rnt = max(rnt,trnt);
38 }
39 write(rnt);
40 return 0;
41 }
