import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner stdIn = new Scanner(System.in);
        
        int numberOfSteps = Integer.parseInt(stdIn.nextLine());
        String hikeString = stdIn.nextLine();
        int numOfValleysTraveled = 0;
        int currentElevation = 0;
        
        for(int i = 0; i < hikeString.length(); i++){
            char nextStep = hikeString.charAt(i);
            
            if(nextStep == 'U'){
                if(currentElevation + 1 == 0){
                    numOfValleysTraveled += 1;
                }
                currentElevation += 1;
            }
            else if(nextStep == 'D'){
                currentElevation -= 1;
            }
            
        }
        
        System.out.print(numOfValleysTraveled);
    }
}