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 = Convert.ToInt32(Console.ReadLine());
        char[] myArray = new char[n];
        string s = Console.ReadLine();
        
        int check = 0;
        int flag = 0;
        int count = 0;
        for(int i=0;i<n;i++){
            if(s[i]=='U'){
                
            
                check++;
                if(flag==1)
                    flag = 0;
            }
            if(s[i]=='D')
                {
                check--;
                if(check==-1)
                    if(flag==0){
                    count++;
                    flag=1;
                }
                    
             }
      // Console.WriteLine("Flag is "+flag);    
      // Console.WriteLine(check); 
      // Console.WriteLine(count);
     //  Console.WriteLine();
    }
        //Console.WriteLine("Final count is");
        Console.WriteLine(count);
    }
}