using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        int n = Convert.ToInt32(Console.ReadLine());
            string str = Console.ReadLine();
            char[] arr = str.ToCharArray();
            int currentLevel = 0;
            int numberOfValley = 0;
            bool valleyOver = true;
            for (int i = 0; i < n; i++)
            {
                if (arr[i] == 'U')
                {
                    currentLevel++;
                }
                else
                {
                    currentLevel--;
                }
                if (valleyOver && currentLevel == -1)
                {
                    valleyOver = false;
                    numberOfValley++;
                }
                if (currentLevel >= 0)
                {
                    valleyOver = true;
                }
            }
            Console.WriteLine(numberOfValley);
    }
}