Tenant shall pay to Landlord the Minimum Guaranteed Rental in monthly installments in the amount specified in Section 1.1 above. The first such monthly installment shall be due and payable upon execution of this Lease, and will be credited towards Tenant's first month's rent, and subsequent installments shall be due and payable on or before the first day of each succeeding calendar month during the Lease Term; provided, that if the Commencement Date is a date other than the first day of a calendar month, there shall be due and payable on or before such date as the Minimum Guaranteed Rental for the balance of such calendar month . a sum equal to that proportion of the Minimum Guaranteed Rental due for the first full calendar month, multiplied by a fraction the numerator of which is the number of days from the Commencement Date to the end of the calendar month during which the Commencement Date shall fall and denominator which is the total number of days in such month.