import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int res = 0;
        int c=0;
        int flag=0;
        int n = in.nextInt();
        String s = in.next();
        for(int i=0;i<s.length();i++){
            if(s.charAt(i)=='U')
                c++;
            else if(s.charAt(i)=='D')
                c--;
            if(c<0)
                flag=1;
            if(c==0 && flag==1){
                res++;
                flag=0;
            }
        }
        System.out.println(res);
    }
}