using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

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 */
        Console.ReadLine();
            var values = Console.ReadLine().ToCharArray().ToList();
            var number = 0;
            var count = 0;
            values.ForEach(
                val =>
                    {
                        number = val == 'U' ? number + 1 : number - 1;
                        if (val == 'U' && number == 0)
                        {
                            count++;
                        }
                    });
            Console.WriteLine(count);
    }
}