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 in = new Scanner(System.in);
        int n = in.nextInt();
        String s = in.next();
        int tally=0;
        int valleyCount=0;
        for(int i=0; i<n; i++){
            Character c = s.charAt(i);
            int previous = tally;
            if(c.equals('U'))tally++;
            else tally--;
            
            if(previous==0 && tally==-1) valleyCount++;
        }
        System.out.println(valleyCount);
    }
}