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) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String stepStr = in.next();
        String[] steps = new String[n];
        for (int arr_i = 0; arr_i < n; arr_i++) {
            steps[arr_i] = String.valueOf(stepStr.charAt(arr_i));
        }
        int altitude = 0;
        int valleyCount = 0;
        boolean inValley = false;
        for (int i = 0; i < n; i++) {
            if (steps[i].equals("U")) {
                altitude++;
                if (altitude == 0) {
                    valleyCount++;
                }
            }
            else {
                altitude--;
            }
        }
        System.out.println(valleyCount);
    }
}