Vasya has a pile, that consists of some number of stones. n times he either took one stone from the pile or added one stone to the pile. The pile was non-empty before each operation of taking one stone from the pile.

You are given n operations which Vasya has made. Find the minimal possible number of stones that can be in the pile after making these operations.

Input

The first line contains one positive integer n — the number of operations, that have been made by Vasya (1 ≤ n ≤ 100).

The next line contains the string s, consisting of n symbols, equal to "-" (without quotes) or "+" (without quotes). If Vasya took the stone on i-th operation, s_i is equal to "-" (without quotes), if added, s_i is equal to "+" (without quotes).

Output

Print one integer — the minimal possible number of stones that can be in the pile after these n operations.

Examples

Input


3
---


Output


0

Input


4
++++


Output


4

Input


2
-+


Output


1

Input


5
++-++


Output


3

Note

In the first test, if Vasya had 3 stones in the pile at the beginning, after making operations the number of stones will be equal to 0. It is impossible to have less number of piles, so the answer is 0. Please notice, that the number of stones at the beginning can't be less, than 3, because in this case, Vasya won't be able to take a stone on some operation (the pile will be empty).

In the second test, if Vasya had 0 stones in the pile at the beginning, after making operations the number of stones will be equal to 4. It is impossible to have less number of piles because after making 4 operations the number of stones in the pile increases on 4 stones. So, the answer is 4.

In the third test, if Vasya had 1 stone in the pile at the beginning, after making operations the number of stones will be equal to 1. It can be proved, that it is impossible to have less number of stones after making the operations.

In the fourth test, if Vasya had 0 stones in the pile at the beginning, after making operations the number of stones will be equal to 3.
import java.util.*;
import java.io.*;
import java.math.*;
public class mmm
{
    static class InputReader {
        public BufferedReader br;
        public StringTokenizer token;
        public InputReader(InputStream stream)
        {
            br=new BufferedReader(new InputStreamReader(stream),32768);
            token=null;
        }

        public String next()
        {
            while(token==null || !token.hasMoreTokens())
            {
                try
                {
                    token=new StringTokenizer(br.readLine());
                }
                catch(IOException e)
                {
                    throw new RuntimeException(e);
                }
            }
            return token.nextToken();
        }

        public int nextInt()
        {
            return Integer.parseInt(next());
        }

        public long nextLong()
        {
            return Long.parseLong(next());
        }
    }
    static class card{
        long l;
        long r;
        int in;
        public card(long ch,long i,int in)
        {
            this.l=ch;
            this.r=i;
            this.in=in;
        }
    }
    static class sort implements Comparator<card>
    {
        public int compare(card o1,card o2)
        {
            if(o1.l!=o2.l)
                return (int)(o1.l-o2.l);
            else
                return (int)(o1.r-o2.r)*-1;
        }
    }
    static void shuffle(long a[])
    {
    List<Long> l=new ArrayList<>();
    for(int i=0;i<a.length;i++)
    l.add(a[i]);
    Collections.shuffle(l);
    for(int i=0;i<a.length;i++)
    a[i]=l.get(i);
    }

    /*static long gcd(long a,long b)
    {
    if(b==0)
    return a;
    else
    return gcd(b,a%b);
    }
    static int ans1=Integer.MAX_VALUE,ans2=Integer.MAX_VALUE,ans3=Integer.MAX_VALUE,ans4=Integer.MAX_VALUE;
    static boolean v[]=new boolean[101];
    static void dfs(Integer so,Set<Integer> s[]){
    if(!v[so.intValue()])
    {
    v[so]=true;
    for(Integer h:s[so.intValue()])
    {
    if(!v[h.intValue()])
    dfs(h,s);
    }
    }
    }
    static class Print{
    public PrintWriter out;
    Print(OutputStream o)
    {
    out=new PrintWriter(o);
    }
    }
    static int CeilIndex(int A[], int l, int r, int key) 
    { 
    while (r - l > 1) { 
    int m = l + (r - l) / 2; 
    if (A[m] >= key) 
    r = m; 
    else
    l = m; 
    } 

    return r; 
    } 

    static int LongestIncreasingSubsequenceLength(int A[], int size) 
    { 
    // Add boundary case, when array size is one 
    int[] tailTable = new int[size]; 
    int len; // always points empty slot 
    tailTable[0] = A[0]; 
    len = 1; 
    for (int i = 1; i < size; i++) { 
    if (A[i] < tailTable[0]) 
    // new smallest value 
    tailTable[0] = A[i]; 

    else if (A[i] > tailTable[len - 1]) 
    // A[i] wants to extend largest subsequence 
    tailTable[len++] = A[i]; 

    else
    // A[i] wants to be current end candidate of an existing 
    // subsequence. It will replace ceil value in tailTable 
    tailTable[CeilIndex(tailTable, -1, len - 1, A[i])] = A[i]; 
    } 
    return len; 
    }*/
    /*static int binary(int n)
    {
    int s=1;
    while(n>0)
    {
    s=s<<1;
    n--;
    }
    return s-1;
    }
    static StringBuilder bin(int i,int n)
    {
    StringBuilder s=new StringBuilder();
    while(i>0)
    {
    s.append(i%2);
    i=i/2;
    }
    while(s.length()!=n)
    {
    s.append(0);
    }
    return s.reverse();
    }*/
    static boolean valid(int i,int j,int n,int m)
    {
        if(i<n && i>=0 && j<m && j>=0)
        return true;
        else
        return false;
    }
    public static void main(String[] args) 
    {
        InputReader sc=new InputReader(System.in);
        int n=sc.nextInt();
        char a[]=sc.next().toCharArray();
        int c=0,f=0;
        List<Integer> l=new ArrayList();
        if(a[0]=='+')
        l.add(1);
        else
        l.add(-1);
        int n1=1;
        for(int i=1;i<n;i++)
        {
           if(a[i]=='+' && a[i-1]=='+')
           l.add(l.get(n1-1)+1);
           else if(a[i]=='+' && a[i-1]=='-')
           l.add(l.get(n1-1)+1);
           else if(a[i]=='-' && a[i-1]=='+')
           l.add(l.get(n1-1)-1);
           else
           l.add(l.get(n1-1)-1);
           n1++;
        }
        int min=Integer.MAX_VALUE;
        for(int i=0;i<l.size();i++)
        {
            min=Math.min(min,l.get(i));
        }
        int t=Math.abs(Math.min(min,0));
        for(int i=0;i<n;i++)
        {
            if(a[i]=='+')
            t++;
            else
            t--;
        }
        System.out.println(t);
    }
}