using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        int charCount = Convert.ToInt32(Console.ReadLine());
        string steps = Console.ReadLine();
        
        int height = 0;
        int valleyCount = 0;
        for(int i = 0; i < charCount; ++i)
        {
            if (steps[i] == 'U')
            {
                ++height;
                if (height == 0)
                {
                     ++valleyCount;
                }
            }
            else if (steps[i] == 'D')
            {
                --height;
            }
        }
        
        Console.WriteLine(valleyCount);
    }
}