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 numberOfSteps = int.Parse(Console.ReadLine());
        string steps = Console.ReadLine();
        int numOfVallies=0;
        int offsetFromSeaLevel=0;
        char startingStep=' ';
        for(int i=0;i<numberOfSteps;i++)
            {
            char step = steps[i];
            if(offsetFromSeaLevel==0)
                {
                //reset starting step , he's beginning a new journy from sea level
                startingStep=step;
                }
            if(step=='D')
            {
                offsetFromSeaLevel = offsetFromSeaLevel-1;    
            }
            else
            {
             offsetFromSeaLevel = offsetFromSeaLevel+1;
                
            }
            
            
            if(offsetFromSeaLevel==0 && startingStep=='D')
                {                   
                    numOfVallies++;
                }
                
                
                
        
       }
        Console.WriteLine(numOfVallies.ToString());           
 
    }
}