The recent steps towards modernization of the Armed Forces have been made possible by Russias economic resurgence based on oil and gas revenues as well a strengthening of its own domestic market. Currently, the military is in the middle of a major equipment upgrade, with the government in the process of spending about $200 billion (what equals to about $400 billion in PPP dollars) on development and production of military equipment between 2006-2015 under the State Armament Programme for 2007-2015 (GPV — госпрограмма вооружения). Mainly as a result of lessons learned during the August War, the State Armament Programme for 2011-2020 was launched in December 2010. Prime Minister Putin announced that 20-21.5 trillion rubles (over $650 billion) will be allocated to purchase new hardware in the next 10 years. The aim is to have a growth of 30% of modern equipment in the army, navy and air force by 2015, and of 70% by 2020. In some categories, the proportion of new weapon systems will reach 80% or even 100%. At this point, the Russian MoD plans to purchase, among others, up to 250 ICBMs, 800 aircraft, 1,200 helicopters, 44 submarines, 36 frigates, 28 corvettes, 18 cruisers, 24 destroyers, 6 aircraft carriers, and 62 air defence battalions. Several existing types will be upgraded. The share of modern and advanced weapons in some branches of the Russian Armed Forces currently amounts over 60 percent, the Defence Ministry reported 31 July 2015.

Based on the above article, answer a question. How many more submarines are to be purchased than frigates?
8