using System;

class Solution 
{
    static void Main(String[] args) 
    {
        int n = int.Parse(Console.ReadLine());
        string steps = Console.ReadLine();
        
        int level = 0;
        int valleys = 0;
        
        for (int i = 0; i < n; i++)
        {
            if (steps[i] == 'U')
            {
                if (++level == 0)
                {
                    valleys++;
                }
            }
            else
            {
                level--;
            }
        }
        
        Console.WriteLine(valleys);
    }
}