using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CountingValleys
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = Convert.ToInt32(Console.ReadLine());
            char[] s = Console.ReadLine().ToCharArray();
            int countu = 0;
            int countd = 0;
            int countv = 0;
            for(int i = 0; i < n; i++)
            {
                if(s[i].Equals('U'))
                {
                    countu++;
                }
                else
                {
                    countd++;
                }
                if((countd == countu) && s[i].Equals('U'))
                {
                    countv++;
                    countu = 0;
                    countd = 0;
                }
                else if((countd == countu) && s[i].Equals('D'))
                {
                    countu = 0;
                    countd = 0;
                }
            }
            Console.WriteLine(countv);
        }
    }
}