def calculate_sum(n):
    # Calculate the sum of numbers from 1 to n
    total_sum = (n * (n + 1)) // 2
 
    # Subtract all the 2nd values from the sum
    if n % 2 == 0:
        total_sum -= (n // 2) * (n // 2 + 1)
    else:
        total_sum -= ((n - 1) // 2) * ((n - 1) // 2 + 1)
 
    return total_sum
 
try:
    # Read the number of test cases
    t = int(input())
 
    # Process each test case
    for _ in range(t):
        n = int(input())
        result = calculate_sum(n)
        print(result)
 
except ValueError:
    print("Invalid input. Please enter valid integers.")
except ZeroDivisionError:
    print("Error: Division by zero occurred.")
except Exception as e:
    print("An error occurred:", e)
 

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