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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        
        Scanner scan = new Scanner(System.in);
        int steps = Integer.parseInt(scan.nextLine());
        String path = scan.nextLine();
        
        int currHeight = 0, height = 0;
        int valleyNum = 0;
        
        for(int i = 0; i < path.length(); i ++)
        {
            if(path.substring(i,i+1).equals("U"))
            {
                height ++;
            }
            else if(path.substring(i,i+1).equals("D"))
            {
                height --;
            }

            
            if(currHeight == 0 && height == -1)
            {
                valleyNum ++;
            }
            
            currHeight = height;
        }
        
        System.out.println(valleyNum);
        
    }
}