import java.util.Scanner;

public class Solution {

  public static void main(String[] args) throws Exception{
	//  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	  Scanner scanner = new Scanner(System.in);
      String N = scanner.nextLine();
      String str=scanner.nextLine();
      int current=0;
      int previous=0;
      int val=0;
      for (int i = 0; i < str.length(); i++) {
       //   System.out.println("hello world");
    	  previous=current;
    	  char c=str.charAt(i);
    	  if(c=='U'){
    		  current++;
    	  }else{
    		  current--;
    	  }
    if(current==-1 && previous==0){
    	val++;
    }
    	  
      }
      System.out.println(val);
    }
  
  
}