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 in = new Scanner(System.in);
        int n = in.nextInt();
        in.nextLine();
        String path = in.nextLine();
        int height = 0, count = 0;
        boolean valleyStarted = false;
        for(int i = 0; i < n; i++){
            char step = path.charAt(i);
            if(height < 0 && step == 'U' && valleyStarted){
                count++;
                valleyStarted = false;
            }
            if(height == 0 && step == 'D'){
                valleyStarted = true;
            }        
            if(step =='D'){
                height--;
            }else{
                height++;
            }
        }
        System.out.println(count);
    }
}