import java.io.*;
import java.util.*;

public class Solution {
    
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int numSteps = in.nextInt();
        String upsndowns = in.next();
        int elev = 0;
        int prevElev = 0;
        int toReturn = 0;

        for (int j = 0; j < upsndowns.length(); j++) {
            if (upsndowns.substring(j, j+1).equals("D")) {
                prevElev = elev;
                elev--;
            } else {
                prevElev = elev;
                elev++;
            }
            if ((j > 0) && (elev == 0) && (prevElev < 0)) {
                    toReturn++;
                }
        }

        System.out.println(toReturn);
    }
}
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */