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 numSteps = Convert.ToInt32(Console.ReadLine());
        string steps = Console.ReadLine();
        int sealevel = 0;
        int numValleys = 0;
        
        foreach(char c in steps.ToUpper())
        {
            int previous = sealevel;
            
            if(c == 'U')
            {
                sealevel++;
            }
            else
            {
                sealevel--;
            }
            
            if(sealevel == 0 && previous < 0)
            {
                numValleys++;
            }
        }
        
        Console.WriteLine(numValleys);
    }
}