using System;
using System.Collections.Generic;
using System.IO;
class Solution
{
    static void Main(String[] args)
    {
        int n = Convert.ToInt32(Console.ReadLine());
        string hike = Console.ReadLine();       
        int steps = 0;
        int valley = 0;
        for (int i = 0; i < n; i++)
        {
            if (hike[i] == 'U')
            {
                steps++;
            }
            if (hike[i] == 'D')
            {
                steps--;
            }
            if (steps == 0 && hike[i] == 'U')
            {
                valley++;
            }
        }
        Console.WriteLine(valley);
        //Console.ReadKey();
    }
}