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. */
        try{
		  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			
		  int size = Integer.parseInt(br.readLine());
          String steps = br.readLine();
          
          int elevation = 0;  
          boolean above = true;
          int vallies = 0;  
            
          // loop through each step
          for(int i = 0; i < steps.length(); i++){
              char step = steps.charAt(i);
              
              if(step == 'U'){
                  elevation++;
              }
              else{
                  elevation--;
              }
              
              if(above && elevation < 0){
                  // we were above, and went below
                  vallies++;
                  above = false;
              }
              else if(!above && elevation >= 0){
                  // we were below, and went above
                  above = true;
              }
          }
            
          System.out.println(vallies);  
			
	   }catch(IOException io){
		  io.printStackTrace();
	   }
        
    }
}