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 scan = new Scanner(System.in);
        int n = scan.nextInt();
        scan.nextLine();
        String s = scan.nextLine();
        
        char[] c = new char[n];
        c = s.toCharArray();
        int i=0,vc=0,curr_level=0;

        if(c[0] == 'D')
            vc=1;
        
        for(;i<n;i++)
            {
            if(c[i] == 'D')
                curr_level--;     
            else
                curr_level++;

        if(((i+1)<n)&&(curr_level == 0)&&(c[i+1] == 'D'))
            vc++;       
        }
        System.out.println(vc);
    }
}