import java.io.*;
import java.util.*;

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 scanner = new Scanner(System.in);
        int num_steps = scanner.nextInt();
        scanner.nextLine();
        String steps = scanner.nextLine();
        System.out.println(get_num_valleys(steps));
    }
    public static int get_num_valleys(String steps){
        int curr_level=0,prev=0, num_valleys =0;
        for(int i=0;i<steps.length();i++){
            char step = steps.charAt(i);
            prev = curr_level;
            if(step =='U'){
                curr_level++;
            }else{
                curr_level--;
            }
            //System.out.println(prev+" "+curr_level);
            if(prev==0 && curr_level<0){
                num_valleys++;
            }
        }
        return num_valleys;
    }
}