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 str = in.nextLine();
        String[] arr = str.split("");

        int sum = 0;
        ArrayList<Integer> list = new ArrayList<>();
        for(int i = 1; i <= n; i++) {
            if("U".equals(arr[i]))
                sum = sum +1;
            else
                sum = sum -1;
            //System.out.println(sum);
            list.add(sum);
        }
        list.add(0, 0);
        int count = 0;
        for(int k = 1; k < list.size(); k++) {
            if(list.get(k) == 0 && list.get(k-1) < 0)
                count++;
        }
        System.out.println(count);
            
        
    }
}