import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String path = in.next();
        int position = 0;
        int valey = 0;

        for (char c : path.toCharArray()) {
            if(c=='D'){
                position --;
            }else{
                position ++;
                if(position==0){
                    valey++;
                }
            }
        }
        System.out.print(valey);
    }
}