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

class Solution {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int size=sc.nextInt();
        int i,seaLevel=0,res=0;
        sc.nextLine();
        String str=sc.nextLine(); 
        char a[]=str.toCharArray();
        for(i=0;i<size;i++)
        {
           if(a[i]=='U')
           {
              seaLevel++;
           }   
           else
           {
              seaLevel--;
           }     
           if(seaLevel==0 && a[i]=='U')
           {
             res++; 
           }  
        } 
        System.out.println(res);
    }
}