using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution */
        int n = int.Parse(Console.ReadLine());
        string path = Console.ReadLine();
        int level = 0 ; 
        int Valleys = 0 ;
        for(int i = 0 ; i < n; i++)
        {
           if(path[i] == 'U')
           {
               level++;
               if (level == 0)
               {
                   Valleys++;
               }
           }
            else{
                level--;
            }
                  
        }
        Console.WriteLine(Valleys);
    }
}