2f

def sum_of_products(n1, n2):
    sum = 0
    for i in range(1, n1 + 1):
        sum += i * (i + 1)
    return sum

n1 = int(input("Enter the value of n1: "))
n2 = int(input("Enter the value of n2: "))
sum = sum_of_products(n1, n2)
print("Sum of the series:", sum)