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 sc = new Scanner(System.in);
        int steps = sc.nextInt();
        String seq = sc.next();
        int height = 0;
        int valleys = 0;
        int prevHeight = 0;
        for(int i = 0;i < seq.length() ; i++) {
            Character c = seq.charAt(i);
            if(c == 'U') {
                ++height;
            }else if(c == 'D') {
                --height;
            }
             if(height < 0 && prevHeight == 0) {
                 ++valleys;
             }
            
            prevHeight = height;
        }
        
        System.out.println(valleys);
    }
}