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

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. */
        int height = 0;
        boolean inValley = false;
        int numValleys = 0;
        Scanner s = new Scanner(System.in);
        int numSteps = s.nextInt();
        s.nextLine();
        String directions = s.nextLine();
        for(int i = 0; i < numSteps; i++) {
            if(directions.charAt(i)=='U') {
                height++;
            }
            else {
                height--;
            }
            if(height<0 && !inValley) {
                numValleys++;
                inValley = true;
            }
            if(height >= 0 && inValley) {
                inValley = false;
            }
        }
        System.out.println(numValleys);
    }
}