import java.util.*;
import java.lang.*;
import java.io.*;
 
class Ideone
{
	public static void main (String[] args) 
	{
		int n; //описание переменных
	    double a;
	    double sum = 0;
	    Scanner sc = new Scanner(System.in);
	    n = sc.nextInt();
	    for (int i=0;i<n;i++)
	    {
	    	a = sc.nextDouble();
	        sum += a; // вычисление суммы
	        System.out.printf("%f\n",Math.abs(sum)); 
    	}
	}
}

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