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 */
        int n = Convert.ToInt32(Console.ReadLine()), levelRespectSea = 0, numberOfValleys = 0;
        bool goingUp = false;
        while (n-- > 0)
        {
            char character = Convert.ToChar(Console.Read());
            if (character == 'U')
            {
                goingUp = true;
                levelRespectSea++;
            }
            else
            {
                goingUp = false;
                levelRespectSea--;
            }
            if (levelRespectSea == 0 && goingUp == true)
                numberOfValleys++;
        }
        Console.WriteLine(numberOfValleys);
    }
}