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 scanner = new Scanner(System.in);
        int steps = scanner.nextInt();
        String stepString = scanner.next();
        //System.out.println(stepString);
        int stringLength = stepString.length();
        char[] singleStep = new char[steps+1];
        int temp =0;
        int tempPrevious =0;
        int valley =0;
        
        stepString.getChars(0,stringLength, singleStep,0);
        
        for (int i =0;i<steps;i++) {
            //System.out.println(singleStep[i]);
            tempPrevious = temp;
            if (singleStep[i] == 'U') {
                temp++;
            } else {
                temp--;
            }
            
                      
            if (tempPrevious >=0 && temp<0) {
                
                valley++;
            }
                
            }
        System.out.println(valley);
        }
       
        
        
        
       
        
    
}