using System;
using System.Collections.Generic;
using System.IO;
class Solution 
{
    static void Main(String[] args) 
    {
        int n = int.Parse(Console.ReadLine());
            char[] array = Console.ReadLine().ToCharArray();
            int level = 0;
            int valley = 0;
            bool startMountain = false;
            foreach (var step in array)
            {
                if (step == 'U')
                {
                    if (level == 0)
                        startMountain = true;
                    level++;
                }
                else
                {
                    if (level == 0)
                        startMountain = false;
                    level--;
                }

                if (level == 0 && startMountain == false)
                    valley++;
            }
            Console.WriteLine(valley);
    }
}