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());
        string hike = Console.ReadLine();
        char [] arr = hike.ToCharArray();
        int valley = 0;
        int level = 0; //sea level
        bool atSeaLevel = true;
        for(int i=0;i<n;i++)
        {
            level = (arr[i] == 'U')?level + 1: level -1; 
            if(level < 0 && atSeaLevel)
                valley++; atSeaLevel = false;
            
            if(level == 0)
                atSeaLevel = true;
        }
        
        Console.WriteLine(valley);
    }
}