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();
        
        int currentHeight=0;
        int numValleys=0;
        
        for (int i=0; i<n; i++) {
            
            int slope = s.charAt(i) == 'U' ? 1 : -1;
            
            if (currentHeight == -1 && slope == 1) {
                numValleys++;
            }
            currentHeight += slope;
        }
        
        System.out.println(numValleys);
        
    }
}