import java.util.*;

public class main {
	public static void main(String args[]){
		Scanner data = new Scanner(System.in);
		int n = data.nextInt();
		data.nextLine();
		int[] cnt = new int[n];
		String s = data.nextLine();
		int count = 0;
		for(int i=0;i<n;i++){
			if(s.charAt(i)=='U')
				cnt[i] = ++count;
			else
				cnt[i]=--count;
		}
		int countt = 0;
		for(int i=1;i<n;i++){
			if(cnt[i]==0 && cnt[i-1]<0)
				countt++;
		}
		System.out.println(countt);
	}
}