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 in = new Scanner(System.in);
        int N = Integer.parseInt(in.nextLine());
        String path = in.nextLine();
        
        
        char[] pathChars = path.toCharArray();
        int valleys = 0, seaLevel = 0;
        boolean isvalley = false;
        
        for(int i = 0; i < N; i++) {
            
            seaLevel = pathChars[i] == 'U' ? (seaLevel + 1) : (seaLevel - 1);
                        
            if(seaLevel > 0) {
                isvalley = false;
            }
            else if(seaLevel < 0 ) {
                isvalley = true;
            }
            
            if(seaLevel == 0) {
                if(isvalley) valleys++;
            }
        }
        
        System.out.println(valleys);
        
    }
}