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

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner in =new Scanner(System.in);
        int n=in.nextInt();
        String val=in.next();
      // System.out.println(val);
        int prev=0,count=0,sum=0;
        for(int i=0;i<n;i++)
            {
            char c=val.charAt(i);
            prev=sum;
            //System.out.println(c=='U');
            if(c=='U')
                sum=sum +1;
            else sum--;
            
          //  System.out.println("prev-->"+prev);
            //System.out.println("current-->"+sum);
            if(prev==0&&sum<0)
                count++;
                
        }
        System.out.println(count);
    }
}