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 = in.nextInt();
        int level = 0;
        int valleys = 0;
        String inp = in.next();
        for(int i = 0; i < n ; i++){
            char c = inp.charAt(i);
            if (c == 'U')
                {
                level++;if (level ==0){valleys++;}
            }
            else{
                level--;
            }
        }System.out.println(valleys);
    }
}