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 */
        var seaLevel = true;
        var n = int.Parse(Console.ReadLine());
        var input = Console.ReadLine();
        int level = 0;
        int valleys = 0;
        for(var i=0;i<n;i++)
            {
            switch(input[i]){
                case 'U':
                level++;
                seaLevel = level == 0;
                break;
                case 'D':
                if(seaLevel) 
                valleys++;    
                level--;
                seaLevel = level == 0;
                break;
            }
        }
        
        Console.WriteLine(valleys);
    }
}