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 in = new Scanner(System.in);
         int n = in.nextInt();
         String s1 = in.nextLine();
         String s = in.nextLine();
        
         String[] steps= s.split("");
        int sum = 0;
        boolean enteredValley = false;
        int sumLastStep = 0;
        int numberValleys =0;
       
        for(String step : steps){
            if(step.equals("U"))
                sum++;
            else if(step.equals("D"))
                sum--;
             if(sumLastStep >= 0 && sum <0){
                enteredValley = true;
             } 
             if(sumLastStep <0 && sum >= 0 && enteredValley){
                 enteredValley = false;
                 numberValleys ++;
             }
            
            sumLastStep = sum;
        }
        System.out.print(numberValleys);
    
    }
}