Soviet ground forces, under the command of Marshal Sergei Sokolov (Marshal), entered Afghanistan from the north on December 27. In the morning, the 103rd Guards Airborne Division landed at the airport at Bagram and the deployment of Soviet troops in Afghanistan was underway. The force that entered Afghanistan, in addition to the 103rd Guards Airborne Division, was under command of the 40th Army (Soviet Union) and consisted of the 108th Motor Rifle Division and 5th Guards Motor Rifle Divisions, the 860th Separate Motor Rifle Regiment, the 56th Guards Air Assault Brigade, the 36th Mixed Air Corps. Later on the 201st Motor Rifle Division and 68th Motor Rifle Divisions also entered the country, along with other smaller units. In all, the initial Soviet force was around 1,800 tanks, 80,000 soldiers and 2,000 Armoured fighting vehicle. In the second week alone, Soviet aircraft had made a total of 4,000 flights into Kabul. With the arrival of the two later divisions, the total Soviet force rose to over 100,000 personnel.
Question: How many more personnel did the Soviets have over initial forces?
Answer: 20000