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 len = Int32.Parse(Console.ReadLine());
		string steps = Console.ReadLine();
		int position = 0;
        bool movingup = false, belowSeaLevel = false;
        int valleys = 0; 
        
        for(int i = 0; i < len; i++){
            if(steps[i] == 'U'){
                movingup = true;
                position += 1;
            }else{
                movingup = false;
                position -= 1;
            }
            
            belowSeaLevel = position < 0 ? true : false;
            if(position == 0 && movingup == true && belowSeaLevel == false)
                valleys++;
            
        }
        Console.WriteLine(valleys);
    }
}