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 s = new Scanner(System.in);
        long n = s.nextLong();
        String str = s.next();
        char[] arr = str.toCharArray();
        long counter = 0;
        boolean seaLevel = true;
        long valleyCount = 0;
        for(int i=0; i<arr.length; i++){
            if('U' == arr[i]){
                counter++;
                seaLevel = false;
            }else{
                if(seaLevel){
                    seaLevel = false;
                    valleyCount++;
                }
                counter--;
            }
            if(counter == 0){
                seaLevel = true;
            }
        }
        System.out.println(valleyCount);
    }
}