using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        int total = Convert.ToInt32(Console.ReadLine());
        bool isGoingUp = false;
        int level = 0;
        int valleyCount = 0;
        
        string input = Console.ReadLine();
        int inputLength = input.Length;
        string[] steps = new string[inputLength];
        for(int i = 0; i < inputLength; i++) {
            steps[i] = input.Substring(i, 1);
        }
        for (int i = 0; i < inputLength; i++){
            if (steps[i].Equals("U")) {
                level++;
                isGoingUp = true;
            }
            else if (steps[i].Equals("D")) {
                level--;
                isGoingUp = false;
            }
            if (level == 0 && isGoingUp) {
                valleyCount++;
            }
        }
        Console.Write(valleyCount);
    }
}