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 length = Convert.ToInt64(Console.ReadLine());
        var steps = Console.ReadLine().ToCharArray();
        var level = 0;
        var valleyCount = 0;

        for (long i = 0; i < length; i++)
        {
            if (steps[i] == 'U')
            {
                level++;
            }
            else
            {
                level--;
            }

            if (level == 0 && steps[i] == 'U')
            {
                valleyCount++;
            }
        }

        Console.WriteLine(valleyCount);
    }
}