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. */
        try (Scanner scan = new Scanner(System.in)) {
            int n = scan.nextInt();
            scan.nextLine();
            String steps = scan.nextLine();
            int level = 0; 
            int count = 0;
            Character last = null;
            boolean valley = false;
            for (int i = 0; i < steps.length(); i ++) {
                char c = steps.charAt(i);
                if (c == 'U') {
                    level ++;
                    if (level == 0 && valley == true) {
                        count ++;
                        valley = false;
                    }                      
                } else {
                    if (level == 0) {
                        valley = true;
                    }
                    level --;
                }
                last = c;
            }
            System.out.println(count);
        }         
    }
}