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 JavaScript (Node.js 12.16.1) (judge verdict: Runtime Error)

function main (input) {
  var args = input.split("\n");
  var arra = args[1].split("");
  var x = 0;
  var a = [0];
  for(var i = 0; i < arra.length; i++){
    if arra[i] === "I"
      x++;
      a[i + 1] = x;
    else
      x--;
      a[i + 1] = x;
  }
  
  var ans = Math.max.apply(null, a);
  console.log(ans);
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'));