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 steps_count = in.nextInt();
        String steps_str = in.next();
        in.close();
        char[] steps = steps_str.toCharArray();
        int sea_level = 0;
        int level = sea_level;
        int valley_counts = 0;
        for (int i=0; i<steps.length; i++) {
            if (level == sea_level && steps[i] == 'D') {
                valley_counts++;
            }
            
            if (steps[i] == 'U') {
                level+=1;
            } else {
                level-=1;
            }
        }
        System.out.println(valley_counts);
    }
}