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 scan = new Scanner(System.in);
        long T = scan.nextLong();
        String seq = scan.next();
        long numValleys = 0;
        boolean under = false;
        boolean over = false;
        long height = 0;
        for (int i = 0; i < T; i++){
            if (seq.charAt(i) == 'U')
                height++;
            else height--;
            if (under && height == 0){
                numValleys++;
            }
            if (height > 0) {over = true; under = false;}
            if (height < 0) {over = false; under = true;}
            if (height == 0) {over = false; under = false;}
        }
        System.out.println(numValleys);
    }
}