using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        int n = Convert.ToInt32(Console.ReadLine());
        int level = 0;
        int count = 0;
        bool bls = true;
        string str = Console.ReadLine();
        foreach(char s in str)
            {
            if(s == 'U')
                level = level + 1;
            else
                {
                level = level - 1;
            }                
                     
            if(level < 0 && bls)
                {
                bls = false;
                count++;
            }
            if(level == 0) 
                bls = true;
        }
        Console.WriteLine(count);
    }
}