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. */
        Scanner in = new Scanner(System.in);
        int n = Integer.parseInt(in.nextLine());
        String str = in.nextLine();
        char[] steps = str.toCharArray();
        
        int count = 0;
        int currentLevel = 0;
        boolean isBelowSeaLevel = false;
        
        for(int i=0; i<n; i++) {
            if(steps[i] == 'D')  {
                currentLevel--;
            } 
            else if(steps[i] == 'U')  {
                currentLevel++;
            } 
            if(currentLevel == 0 && isBelowSeaLevel == true) {
                count++;
                isBelowSeaLevel = false;
            }
            else if(currentLevel < 0) {
                isBelowSeaLevel = true;
            }
        }
        
        System.out.println(count);
    }
}