#include<bits/stdc++.h>
using namespace std;
#define int long long

int32_t main(){

    int n;
    cin >> n;
    string s;
    cin.ignore();
    getline(cin, s);
    set<int> c;
    for(int i = 0; i < n-1; i++){
        int count = 1;
        char x = s[i];
        for(int j = i+1; j < n; j++){
            if(x == '-'){
                count++;
                x = s[j];
            }
            else if((x == '0' || x == '+') && s[j] == '+'){
                count++;
                x = s[j];
            }
        }
        c.insert(count);
    }
    cout << *c.rbegin() << endl;

    
    return 0;
}