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 */
        Console.ReadLine();
        string str = Console.ReadLine();
        int status = 0;
        int valleyCount = 0 ;
        int previousValue = 0;
        foreach(char ch in str){
            previousValue = status;
            if(ch == 'U'){
                status++;
            }
            else if(ch == 'D'){
                status--;
            }
            if(status == 0 && previousValue < 0)
                valleyCount++;
        }
        Console.WriteLine(valleyCount);
    }
}