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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        int level = 0;
        boolean valleyStarted = false;
        boolean valleyEnded = false;
        int count = 0;
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        String steps = sc.next();
        
        for(int i = 0; i < n; i++) {
            if(level == 0 && steps.charAt(i) == 'D') valleyStarted = true;
            //System.out.println("level = " + level);
            switch(steps.charAt(i)) {
                case 'D': level--;
                          break;
                case 'U': level++;
                          break;
                default: break;
            }
            //System.out.println("level = " + level);
            if(level == 0 && steps.charAt(i) == 'U') valleyEnded = true;
            if(valleyStarted && valleyEnded) {
                count++;
                valleyStarted = false;
                valleyEnded = false;
            }
        }
        System.out.println(count);
    }
}