import java.util.Scanner;


public class CountingValleys {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int n,count = 0,countValley = 0,count2 ;
		String s;
		Scanner sc = new Scanner(System.in);
		n = sc.nextInt();
		s = sc.next();
		
		for(int i=0;i<n;i++){
			if(count==0){
				count2 = 0;
			}
			else{
				count2 = 1;
			}
			
			if(s.codePointAt(i)=='U'){
				count++;
				
			}
				
			else{
				count--;
				
			}
		
				
			if(count<0 && count2==0)
				countValley++;
				
			
		}
		System.out.println(countValley);
	}

}