#include <iostream>
#include <fstream>
#include <stdint.h>

using namespace std;

ifstream fin("ssm.in");
ofstream fout("ssm.out");

int n, s, mi = 0, ma = 0;

int main()
{
    fin >> n;
    for (int i = 1; i <= n; ++i)
    {
        int x;
        fin >> x;
        s += x;
        mi = min(mi, s);
        ma = max(ma, s);
    }
    fout << ma - mi;

    return 0;
}