2h

def sum_of_arithmetic_series(a, d, n):
    return (n / 2) * (2 * a + (n - 1) * d)

a = 1  # First term
d = 4  # Common difference
n = int(input("Enter the value of N: "))
sum = sum_of_arithmetic_series(a, d, n)
print("Sum of the series:", sum)