OI I - gie

// https://szkopul.edu.pl/problemset/problem/jzCvm_VOCX4120OGdoLq7RuQ/site/?key=statement

#include <bits/stdc++.h>

// #define GARY_DBG
#define GARY_LIB

constexpr int sizik = 10 * 1000 * 1001, NEW_VAL = 4 * INT16_MIN;

#define ar std::array

typedef std::vector<std::vector<int>> _kra;

std::set<std::pair<int, std::pair<int, int>>> idxs;

void solve() {
    int ans = 0;
    int mm_idx = 1;
    std::string s;
    while (std::getline(std::cin, s)) {
        std::stringstream ss(s);
        int x;
        auto ptr = idxs.begin();
        std::vector<int> to_del;
        while (ss >> x) {
            if (ptr == idxs.end()) {
                auto [it, inserted] = idxs.insert({mm_idx++, {NEW_VAL, NEW_VAL}});
                ptr = it;
            }
            if (x == -99) {
                to_del.push_back((*ptr).first);
            } else {
                if ((*ptr).second.first == NEW_VAL) {
                    auto old = *ptr;
                    idxs.erase(ptr);
                    auto [it, inserted] = idxs.insert({old.first, {std::min(0, x), x}});
                    ptr = it;
                    ans = std::max(ans, x);
                } else {
                    auto old = *ptr;
                    idxs.erase(ptr);
                    auto [it, inserted] = idxs.insert({old.first, {std::min(old.second.first, old.second.second + x), old.second.second + x}});
                    ptr = it;
                    ans = std::max(ans, (*ptr).second.second - old.second.first);
                }
            }
            ptr++;
        }
        for (const auto& a : to_del) {
            auto it = idxs.lower_bound({a, {INT32_MIN, INT32_MIN}});
            if (it != idxs.end() && it->first == a) {
                idxs.erase(it);
            }
        }
    }

    std::cout << ans << '\n';
}

int32_t main() {
#ifndef GARY_DBG
    std::ios_base::sync_with_stdio(0);
    std::cin.tie(0);
    std::cout.tie(0);
#endif

    int t = 1;
    // std::cin >> t;

    for (; t > 0; t--) {
        solve();
    }

    return 0;
}