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 sc = new Scanner(System.in);
        int n = sc.nextInt();
        int i,j=0,vu=0,vd=0,cv=0;
        String a=sc.next();
        String b=" ";
        int c=0;
       while(j<n)
           {
           if(a.charAt(j)=='U')
               vu++;
           if(a.charAt(j)=='D')
               vd++;
           if(vu==vd)
               {
               b=a.substring(c,j);
               if(b.charAt(0)=='D')
                   cv++;
           c=j+1;
           }
           j++;
       }
        System.out.println(cv);
    }
}