public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int times = scan.nextInt();
		scan.nextLine();
		String UDs = scan.nextLine();
		int[] levels = new int[times];
		int up = 0, down = 0, count = 0;
		for (int i = 0; i < times; i++) {
			if (UDs.charAt(i) == 'U') {
				up++;
			} else {
				down++;
			}
			levels[i] = up - down;

		}
		for(int i=0; i<times;i++){
		if(levels[i]<0){
		for(int ii = i; ii<times;ii++){
			if(levels[ii]==0){
				count++;
				i=ii;
				break;
			}
		}
		}
		}
		System.out.println(count);
	}
}