import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        int mountain = 0;
        int valley = 0;   
        int count=0;
        int N=s.nextInt();
        boolean wasMountain = false;
        boolean wasValley   = false;
        String steps=s.nextLine(); steps=s.nextLine();
         
        for(int i=0;i<N;i++){ 
            //System.out.print(count+" ");            
            if(count>0){
                wasMountain = true;                
            }if(count<0){
                wasValley = true;
                //System.out.print("**");
            } 
            if(steps.charAt(i)=='U'){                
                ++count;                
            }else if(steps.charAt(i)=='D'){
                --count;
            }
            if(count==0){                
                if(wasMountain){
                   ++mountain;
                   wasMountain = false;
                   //System.out.print("M");
                } 
                if(wasValley){
                    ++valley;
                    wasValley  = false;
                    //System.out.print("V");
                }
            }                       
        }
        System.out.println(valley);
    }
}