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());
        char[] steps = Console.ReadLine().ToCharArray();
        int balance = 0;
        int prevBalance = 0;
        int valleyCount = 0;

        for (int i = 0; i < n; i++) {
            prevBalance = balance;
            if (steps[i] == 'U') {
                balance++;
            }
            else if (steps[i] == 'D') {
                balance--;
            }

            if (i > 0 && balance == 0) {
                if (prevBalance < 0) {
                    valleyCount++;
                }
            }
        }

        Console.WriteLine(valleyCount.ToString());
    }
}