import java.util.Scanner;


public class Main {


    public static void main(String[] args) {

        long n,count=0,counter=0,count1=0;
        int n1;
        Scanner sc =new Scanner(System.in);
        n = sc.nextLong();
        n1 = (int)n;
        String str;
        str = sc.next();
        if(str.length()!=n)
        {
           System.out.println( "Invalid input");

        }
        for(int i=0;i<str.length();i++)
        {
            if(count1==0)
            {
           if(str.charAt(i)=='U')
           {
               count++;

            }
           if(str.charAt(i)=='D')
           {
               count--;

            }
            }
            
           if(count<0)
           {
                 if(str.charAt(i)=='U')
           {
               count1++;

            }
           if(str.charAt(i)=='D')
           {
               count1--;

            }
                 if(count1==0)
                 {
                     counter++;
                     count=0;
                     count1=0;
               }
           }

        }
        System.out.println(counter);





    }

}