import java.util.Scanner;

public class Hiker {

    public static void main(String[] args) {
        final char UP = 'U', DOWN = 'D';
       Scanner scan = new Scanner(System.in);
        int stepCount = scan.nextInt();
        scan.nextLine();
        String stepTrack = scan.nextLine();
        scan.close();
        char temp ;
        int valleyCount = 0, currentLevel = 0;
        boolean isDown = false;
        for(int stepIdx =0; stepIdx < stepTrack.length(); stepIdx++ ){
            temp = stepTrack.charAt(stepIdx);
            
            if(temp == UP){
                currentLevel++;
                isDown = false;
            }else{
                isDown = true;
                currentLevel--;
            }
            
            if(!isDown && currentLevel == 0){
                valleyCount++ ;
            }
        }
        
        System.out.print(valleyCount);
        
    }
    
}