import java.util.Scanner;
import java.util.concurrent.atomic.AtomicInteger;

public class B {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		in.nextInt();
		AtomicInteger sum = new AtomicInteger();
		AtomicInteger count = new AtomicInteger();
		in.next().chars().map( c -> c == 'U' ? 1 : -1 ).forEach( v -> {
			if (sum.get() == 0 && v < 0) count.addAndGet(1);
			sum.addAndGet(v);
		});
		System.out.println(count);
	}
}