On 9 August 2004, the two companies signed an addendum to the contract, according to which the amount of gas given as a payment was calculated based on a tariff of US$1.09 for the transportation of 1,000 cubic meters of natural gas over a distance of 100 kilometers ; the addendum further stated the price of the natural gas supplied to Ukraine was to be $50 per 1,000 cubic meters (approximately $1.40 per million Btu).