using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        int n = int.Parse(Console.ReadLine());
        string steps = Console.ReadLine();
        int level = 0;
        bool onValley=false;
        int cantValley=0;
        for(int i =0;i<n;i++){
            if(steps[i]=='U'){
                level+=1;
            }else if(steps[i]=='D'){
                level-=1;
            }
            
            if(level<0){
                onValley=true;
            }else if(level==0){
                if(onValley){
                    cantValley++;
                }
                onValley=false;
            }
        }
        Console.WriteLine(cantValley);
    }
}