using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        int n = Convert.ToInt32(Console.ReadLine());
        string steps = Console.ReadLine();
        int height = 0;
        bool inValley = false;
        int ValleyCount = 0;
        for (int i = 0; i < n; i++) {
            char s = steps[i];
            if (s == 'D') {
                height--;
                if (height == -1 && !inValley) {
                    inValley = true;
                }
            } else if (s == 'U') {
                height++;
                if (height == 0 && inValley) {
                    inValley = false;
                    ValleyCount++;
                }
            }
        }
        Console.WriteLine(ValleyCount);
    }
}