package TheTrip;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Trip {

	public Trip(){
		
		int forMaxValue = 0;
		BufferedReader br = new BufferedReader( new InputStreamReader( System.in ) );
		
		try {
			forMaxValue = Integer.parseInt( br.readLine() );
			
		} catch (NumberFormatException e) {
			
			e.printStackTrace();
		} catch (IOException e) {
			
			e.printStackTrace();
		}
		
		arrangement arry = new arrangement(forMaxValue);
		for(int i=0,j=forMaxValue;i<j;i++){
			try {
				arry.inputarry[i] = Float.parseFloat(br.readLine());
			} catch (NumberFormatException e) {
				
				e.printStackTrace();
			} catch (IOException e) {
				
				e.printStackTrace();
			}
		}
		
		System.out.println(arry.operation());
	}
	
	public static void main(String[] args) {

		Trip trip = new Trip();
	}

}