Problem:
Score : 200 points

Problem Statement

You have an integer variable x.
Initially, x=0.

Some person gave you a string S of length N, and using the string you performed the following operation N times.
In the i-th operation, you incremented the value of x by 1 if S_i=I, and decremented the value of x by 1 if S_i=D.

Find the maximum value taken by x during the operations (including before the first operation, and after the last operation).

Constraints

1≤N≤100

|S|=N

No characters except I and D occur in S.

Input

The input is given from Standard Input in the following format:

N
S

Output

Print the maximum value taken by x during the operations.

Sample Input 1

5
IIDID

Sample Output 1

2

After each operation, the value of x becomes 1, 2, 1, 2 and 1, respectively. Thus, the output should be 2, the maximum value.

Sample Input 2

7
DDIDDII

Sample Output 2

0

The initial value x=0 is the maximum value taken by x, thus the output should be 0.

Solution in Java (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;
public class Main {

    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        int number;
        number =input.nextInt();
        int sum=0;
        int max=0,temp;
        String s=input.next();
        for(int i=0;i<number;i++)
        {
            if(s.charAt(i)=='I')
            {
                sum++;
                if(max<sum)
                {
                    max=sum;
                }
            }
            else {
                sum--;
                if (max<sum)
                    max=sum;
            }
        }
        System.out.println(max);
    }
    
}