import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
import java.util.Scanner;

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int steps = scan.nextInt();
        String sequence = scan.next();
        
        int level = 0;
        int numValleys = 0;
        
        for(int i = 0; i < steps; i++) {
            
            char curr = sequence.charAt(i);
            if(curr == 'U') {
                level++;
                if(level == 0) {
                    numValleys++;
                }
            }
            if(curr == 'D') level --;
        }
        
        System.out.println(numValleys);
    }
}