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. */
        Scanner in = new Scanner(System.in);
    int totalSteps = in.nextInt(); 
    String stepSequence = in.next();
    in.close();
    
    int[] levels = new int[totalSteps+1];
    levels[0] = 0;
    char[] charArr = stepSequence.toCharArray();
    
    for ( int i = 0; i < charArr.length; i ++ )
    {
      if ( charArr[i] == 'U') levels[i+1] = levels[i] + 1;
      if ( charArr[i] == 'D') levels[i+1] = levels[i] - 1;
    }
    
    int valleyCount = 0;
    for ( int i = 1; i < levels.length; i ++ )
    {
      if ( levels[i-1] == -1 && levels[i] == 0 ) valleyCount++;
    }
    
    System.out.println(valleyCount);
    }
}