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. */
        int sea_Level = 0;
        int valleys = 0;
        
        Scanner in = new Scanner(System.in);
        
        String steps = in.nextLine();
        
        
        String steps_String = in.nextLine();
        
        for (int step_Count = 0; step_Count < Integer.parseInt(steps); step_Count++){
            
            
            if (steps_String.charAt(step_Count) == 'U') {
                sea_Level++;
            }
            else {
                sea_Level--;
            }
            
            
            if ((sea_Level == 0) && (steps_String.charAt(step_Count) == 'U')){
                valleys++;
            }
        
    }
         System.out.println(valleys);
                }
               
}