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. */
        try(Scanner in = new Scanner(System.in)) {
            int numSteps = in.nextInt();
            in.nextLine();
            int numValleys = 0;
            boolean inValley = false;
            int height = 0;
            for(char c : in.nextLine().toCharArray()) {
                if(c == 'U') {
                    height++;
                } else {
                    height--;
                }
                
                if(height == 0 && inValley) {
                    inValley = false;
                    numValleys++;
                } else if(height < 0) {
                    inValley = true;
                }
            }
            
            System.out.println(numValleys);
        }
    }
}