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

public class Solution {
    public static int getNumberOfSteps(String s) {
        return s.length();
    }

    public static int getFinalHeight(String s) {
        int height = 0;

        for (int i = 0 ; i < s.length() ; i++) {
            if (s.charAt(i) == 'U') {
                height++;
            } else {
                height--;
            }
        }

        return height;
    }

    public static int getValleyCount(String s) {
        int valleyCount = 0;
        int height = 0;
        boolean inValley = false;

        for (int i = 0 ; i < s.length() ; i++) {
            if (s.charAt(i) == 'U') {
                height++;
            } else {
                height--;
            }

            if ((!inValley) && (height < 0)) {
                inValley = true;
                valleyCount++;
            }

            if (inValley && height >= 0) {
                inValley = false;
            }
        }

        return valleyCount;
    }

    public static void main(String[] args) {
        try (Scanner in = new Scanner(System.in);) {

            /* constraints:
             *
             * 2 <= n <= 1_000_000
             */
            int n = in.nextInt();

            String s = in.next();

            System.out.println(getValleyCount(s));
        }
    }
}