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 in = new Scanner(System.in);
        int chars = in.nextInt();
        in.nextLine();
        String str = in.nextLine();
        
        boolean is_valley = false;
        int valleys = 0;
        int height = 0;
        for (int i=0; i<chars; i++) {
            char c = str.charAt(i);
            
            if (c == 'U') height++;
            if (c == 'D') height--;
            
            if (height == -1 && !is_valley) {
                is_valley = true;
                valleys++;
            }
            
            if (height == 0 && is_valley) {
                is_valley = false;
            }
        }
        
        System.out.println(valleys);
    }
}