using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
         int n = Convert.ToInt32(Console.ReadLine());
            char[] temp = Console.ReadLine().ToCharArray();
            //int[] input = Array.ConvertAll(temp, int.Parse);                                     
            int height = 0;
            bool inValley = false;
            bool outSideValley = true;
            int valleys = 0;                                    
            for (int i = 0; i < n; i++)
            {                
                if (temp[i]=='U')
                {
                    height++;
                }
                else
                {
                    height--;
                }
                if (outSideValley)
                {
                    if (height == -1)
                    {
                        inValley = true;
                        valleys++;
                        outSideValley = false;
                    }
                }
                if (height==0)
                {
                    outSideValley = true;
                }
            }
            Console.WriteLine(valleys);        
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution */
    }
}