using System;
using System.Collections.Generic;
using System.IO;
class Solution {
        static void Main(String[] args)
        {
            int n = Convert.ToInt32(Console.ReadLine());
            string steps = Console.ReadLine();
            int level = 0;
            int valleys = 0;

            foreach (var step in steps)
            {
                int newLevel = level + (step == 'U' ? 1 : -1);
                if (newLevel == 0 && level < 0)
                {
                    valleys++;
                }
                level = newLevel;
            }

            Console.WriteLine(valleys);
        }
}