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 scan = new Scanner(System.in);
         int numSteps = scan.nextInt();
      scan.nextLine();
        String steps = scan.nextLine();
        
        int altitude = 0;
        int numValleys = 0;
        for(int i = 0; i < numSteps; i++){
            if (steps.charAt(i) == 'U'){
                altitude++;
            }else{
                altitude--;
                if (altitude == -1)
                    numValleys++;
            }
           
        }
        System.out.println(numValleys);
    }
}