using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        Console.ReadLine();
        string steps = Console.ReadLine();
        Console.WriteLine(NumberOfValleys(steps));
    }
    
    static int NumberOfValleys(string steps){
        int level = 0;
        int valleys = 0;
        foreach (var step in steps){
            if (step == 'U'){
                level++;
                if (level == 0){
                    valleys++;
                }
            }
            if (step == 'D'){
                level--;
            }
        }
        
        return valleys;        
    }
}