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 steps = Convert.ToInt32(Console.ReadLine());
        string directions = Console.ReadLine();
        int seaLevel = 0;
        bool valleyStarted = false; 
        int valleyCounter = 0;
        foreach (char c in directions){
            if ( c == 'U'){
                seaLevel++;
            }
            else if(c == 'D'){
                seaLevel--;
            }
            if(seaLevel == -1 && !valleyStarted){
                valleyStarted = true;
            }
            if(seaLevel == 0 && valleyStarted){
                valleyStarted = false;
                valleyCounter++;
            }
        }
        Console.WriteLine(valleyCounter);
    }
}