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 currlevel = 0;
        int numOfV = 0;
        String nC = in.next();
        for (int i = 0; i < n; i++){
            if (currlevel == 0 && nC.charAt(i) == 'D') {
                numOfV = numOfV + 1;
            }
            if (nC.charAt(i) == 'D') {
                currlevel = currlevel -1;
            } else if (nC.charAt(i) == 'U') {
                currlevel = currlevel +1;
            }
        }
        System.out.println(numOfV);
    }
}