using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        int n=Convert.ToInt32(Console.ReadLine());
        string steps=Console.ReadLine();
        int valleys=0;
        int elevation=0;
        for(int i=0;i<n;++i){
            if(steps[i]=='U'){
                ++elevation;
            }
            else{
                --elevation;
                if(elevation==-1){
                    ++valleys;
                }
            }
        }
        Console.WriteLine(valleys);
    }
}