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 scan = new Scanner(System.in);
        int n = scan.nextInt();
        int level = 0;
        int valleyCount = 0;
        String steps = scan.next();
        for(int i = 0; i < n; i++) {
            char step = steps.charAt(i);
            if(step == 'D') {
                if(level-- == 0) {
                    valleyCount++;
                }
            } else if(step == 'U') {
                level++;
            }
        }
        System.out.println(valleyCount);
    }
}