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 heightAboveSeaLevel = 0;
        int noValleys = 0;
        
        int noSteps = int.Parse(Console.ReadLine());
        string stepProfile = Console.ReadLine();
        
        for (int i=0; i < noSteps; i++)
        {
            // Console.WriteLine(stepProfile[i]);
            
            char currentStep = stepProfile[i];
            
            if (stepProfile[i] == 'U')
            {
                heightAboveSeaLevel++;
                
                if (heightAboveSeaLevel == 0)
                    noValleys++;
            }
            else if (stepProfile[i] == 'D')
            {
                heightAboveSeaLevel--;
            }
        }
        
        Console.WriteLine(noValleys);
        
    }
}