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());
        var s = Console.ReadLine();
        int count = 0;
        var hike = new int[n];
        int sum = 0;
        for (int i = 0; i < n; i++)
        {
            if (s[i] == 'U')
                hike[i] = 1;
            else
                hike[i] = -1;
            int prevSum = sum;
            sum += hike[i];
            if (i > 0 && sum == 0 && prevSum < 0)
                count ++;
        }
        Console.WriteLine(count);
    }
}