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 numValleys = 0;
        String input = in.next();
        
        for(int i = 0; i < n; i++) {
            if (input.charAt(i) == 'U') {
                level++;
                if (level == 0) {
                    numValleys++;
                }
                
            } else {
                level--;
            }
        }
        System.out.print(numValleys);

    }
}