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. */
        //input
        Scanner in = new Scanner(System.in);
        int numOfSteps = in.nextInt();
        String steps = in.next();
        
        int altitude = 0;
        boolean enterValley = false;
        int numValleys = 0;
        for(int i = 0; i < numOfSteps; i++) {
            
            char c = steps.charAt(i);
            if (c == 'U') {
                altitude += 1;
            }
            else if (c == 'D') {
                altitude -= 1;
            }
            
            if (altitude < 0) {
                enterValley = true;
            }
            
            if ((altitude == 0) && enterValley) {
                numValleys++;
                enterValley = false;
            }
        }
        System.out.print(numValleys);
    }
}