import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner e=new Scanner(System.in);
        int n=e.nextInt(),r=0,f=0;e.nextLine();
        String cad=e.nextLine();
		for(int i=0,p=0;i<n;i++){
			if(cad.charAt(i)=='U')p++;
			else p--;
			if(p<0)f=1;
			if(p>=0 && f==1){
				f=0;
				r++;
			}
		}
		System.out.println(r);
    }
}