Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

var infty = 100000 * 2
var scanner = bufio.NewScanner(os.Stdin)

func nextInt() (int, error) {
	scanner.Scan()
	return strconv.Atoi(scanner.Text())
}

func findMaximumSubarray(arr []int) int {
	currentMaxSum, maxSumContainsTail := -infty, -infty

	for j := range arr {
		if arr[j] > maxSumContainsTail+arr[j] {
			maxSumContainsTail = arr[j]
		} else {
			maxSumContainsTail += arr[j]
		}
		if currentMaxSum < maxSumContainsTail {
			currentMaxSum = maxSumContainsTail
		}

		// fmt.Println(arr[j], currentMaxSum, maxSumContainsTail)
	}
	return currentMaxSum
}

func main() {
	scanner.Split(bufio.ScanWords)
	for {
		size, _ := nextInt()
		if size == 0 {
			break
		}

		arr := make([]int, size)
		for i := range arr {
			n, _ := nextInt()
			arr[i] = n
		}

		maximumSum := findMaximumSubarray(arr)
		fmt.Println(maximumSum)
	}
}

C++: #include <iostream>
#include <iomanip>
#include <vector>
#include <set>
#include <map>
#include <list>
#include <iterator>
#include <queue>
#include <stack>
#include <deque>
#include <sstream>
#include <algorithm>
#include <numeric>
#include <string>
#include <cmath>
#include <complex>
#include <functional>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cassert>
#include <cstdlib>
#include <cctype>

#define REP(i,m,n) for(int i=m;i<(int)n;i++)
#define rep(i,n) for(int i=0;i<(int)n;i++)
#define rp(i,c) rep(i,(int)c.size())
#define fr(i,c) for(__typeof((c).begin()) i=(c).begin();i!=(c).end();i++)
#define mp make_pair
#define pb push_back
#define all(c) (c).begin(),(c).end()
#define rall(u) (u).rbegin(),(u).rend()
#define dbg(x) cerr<<#x<<" = "<<(x)<<endl
#define v_delete(a,b) (a).erase(remove((a).begin(), (a).end(), b), (a).end())
#define v_unique(a) (a).erase(unique((a).begin(), (a).end()), (a).end())
#define VV(T) vector<vector< T > >
#define init(a,b) memset((a), (b), sizeof((a)))
using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pi;
const int inf=1<<28;
const double INF=1e10,EPS=1e-9;


template<class T>int SIZE(T a){return a.size();}
template<class T>string IntToString(T num){string res;stringstream ss;ss<<num;return ss.str();}
template<class T>T StringToInt(string str){T res=0;for(int i=0;i<SIZE(str);i++)res=(res*10+str[i]-'0');return res;}
template<class T>T gcd(T a,T b){if(b==0)return a;return gcd(b,a%b);}
template<class T>T lcm(T a,T b){return a/gcd(a,b)*b;}

template <class T> void input(T& a, int n) { for (int i = 0; i < n; ++i) cin >> a[i]; }
template <class T> void input(T* a, int n) { for (int i = 0; i < n; ++i) cin >> a[i]; }
typedef pair<int,int> pii;


int main()
{
	for(int n;cin>>n,n;){
	        vi a(n);
	        rep(i,n)
	            cin>>a[i];

	        vi sum(1);
	        rep(i,n)
	            sum.push_back(sum.back()+a[i]);

	        int res=0;
	        rep(i,n)
	            REP(j,i+1,n+1)
	                res=max(res,sum[j]-sum[i]);
	        cout<<res<<endl;
	    }
	return 0;
}

C++: #include<stdio.h>

int main()
{
	int n;
	while(scanf("%d",&n))
	{
		if(n==0){return 0;}
		
		int a[5000]={0},max=0;
		for(int x=0;x<n;x++)
		{
			scanf("%d",&a[x]);

			for(int y=0;y<=x;y++)
			{
				if(y!=x)
				{
					a[y]+=a[x];
				}
				if(max<a[y])
				{
					max=a[y];
				}
			}
		}
		printf("%d\n",max);
	}
}

C++: #include <iostream>
using namespace std;

int main(){
        int n,a[5010];
        while(cin>>n && n){
                for(int i=0; i<n; i++) cin >> a[i];
                long max = 0;
                for(int k = 2; k<=n; k++){
                        long sum = 0;
                        for(int i=0; i<k; i++){
                                sum += a[i];
                        }
                        cout << sum << "_";
                        max = (max>sum)? max:sum;
                        for(int i=0; i<n-k; i++){
                                sum += (a[k+i] - a[i]);
                                cout << sum << "_";
                                max = (max>sum)? max:sum;
                        }
                        cout << endl;
                }
                cout << max << endl;
        }
        return 0;
}

C++: #include <cstdio>
#include <algorithm>

using namespace std;

int main()
{
	int n;

	while (scanf("%d", &n), n) {
		int s[5001];

		for (int i = 1; i <= n; ++i) {
			int a; scanf("%d", &a);
			s[i] = a + s[i - 1];
		}

		int ma = -100000;

		for (int i = 1; i <= n; ++i) for (int j = 1; j <= i; ++j) {
			ma = max(ma, s[i] - s[j - 1]);
		}

		printf("%d\n", ma);
	}
}

C++: #include<iostream>
#include<string>
#include<cstdio>
using namespace std;
int main()
{
	long long int n,ans = 0;
	while(1){
		cin >> n;
		if(n == 0)break;

		long int a[n];

		ans = 0;

		for(int i = 0;i < n;i++){
			cin >> a[i];
			ans += a[i];
		}
		cout << ans << endl;
	}
}

C++: #include <bits/stdc++.h>
#define endl '\n'
#define int long long
#define lint long long
#define pii pair<int,int>
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
#define SZ(v) ((int)v.size())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
#define MINF(a) memset(a,0x3f,sizeof(a))
#define POW(n) (1LL<<(n))
#define POPCNT(n) (__builtin_popcount(n))
#define IN(i,a,b) (a <= i && i <= b)
using namespace std;
template <typename T> inline bool CHMIN(T& a,T b) { if(a>b) { a=b; return 1; } return 0; }
template <typename T> inline bool CHMAX(T& a,T b) { if(a<b) { a=b; return 1; } return 0; }
template <typename T> inline void SORT(T& a) { sort(ALL(a)); }
template <typename T> inline void REV(T& a) { reverse(ALL(a)); }
template <typename T> inline void UNI(T& a) { sort(ALL(a)); a.erase(unique(ALL(a)),a.end()); }
template <typename T> inline T LB(vector<T>& v, T a) { return *lower_bound(ALL(v),a); }
template <typename T> inline int LBP(vector<T>& v, T a) { return lower_bound(ALL(v),a) - v.begin(); }
template <typename T> inline T UB(vector<T>& v, T a) { return *upper_bound(ALL(v),a); }
template <typename T> inline int UBP(vector<T>& v, T a) { return upper_bound(ALL(v),a) - v.begin(); }
template <typename T1, typename T2> ostream& operator<< (ostream& os, const pair<T1,T2>& p) { os << p.first << " " << p.second; return os; }
template <typename T1, typename T2> istream& operator>> (istream& is, pair<T1,T2>& p) { is >> p.first >> p.second; return is; }
template <typename T> ostream& operator<< (ostream& os, const vector<T>& v) { REP(i,v.size()) { if (i) os << " "; os << v[i]; } return os; }
template <typename T> istream& operator>> (istream& is, vector<T>& v) { for(T& in : v) is >> in; return is; }
template <typename T = int> vector<T> make_v(size_t a) { return vector<T>(a); }
template <typename T, typename... Ts> auto make_v(size_t a, Ts... ts) { return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...)); }
template <typename T, typename V> typename enable_if<is_class<T>::value == 0>::type fill_v(T &t, const V &v) { t = v; }
template <typename T, typename V> typename enable_if<is_class<T>::value != 0>::type fill_v(T &t, const V &v) { for(auto &e : t) fill_v(e,v); }
const lint MOD = 1000000007;
const lint INF = 0x3f3f3f3f3f3f3f3f;
const double EPS = 1e-10;

// 最大部分列を求める
long long maximum_subarray(vector<int> &a) {
    long long res = numeric_limits<long long>::min();
    long long s = 0;
    for (int i = 0; i < (int)a.size(); ++i) {
        s = max(s, 0LL) + a[i];
        res = max(res, s);
    }
    return res;
}

void _main() {
    int n;
    while (cin >> n, n) {
        vector<int> a(n);
        cin >> a;
        cout << maximum_subarray(a) << endl;
    }
}

signed main(signed argc, char **argv) {
    if (argc > 1) {
        if (strchr(argv[1], 'i'))
            freopen("input.txt", "r", stdin);
        if (strchr(argv[1], 'o'))
            freopen("output.txt", "w", stdout);
    }
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    _main();
    return 0;
}