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());
            string input = Console.ReadLine();
            bool valleyStart = false;
            bool valleyEnd = false;
            int count = 0;
            int valleyCount = 0;
            int status = 0;
            foreach(char c in input)
            {
                status++;
                if(c.Equals('U'))
                {
                    count++;
                    if (count == 0 && valleyStart == true)
                    {
                        valleyEnd = true;
                        valleyCount++;
                    }
                }
                if (c.Equals('D'))
                {
                    count--;
                    if(count==0)
                    {
                        valleyStart = true;
                    }
                    else if(status==1 && count==-1)
                        valleyStart = true;
                }                    
            }
            Console.WriteLine(valleyCount);
    }
}