using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        int n = int.Parse(Console.ReadLine());
        string hike = Console.ReadLine();
        
        int height = 0;
        int count = 0;
        for(int i = 0; i < n; i++) {
            if(hike[i] == 'U') {
                height++;
            } else {
                height--;
                if(height == -1)
                {
                    count++;
                }
            }
        }
        
        Console.WriteLine(count);
    }
}