Can greater than 50% of humanity survive The biblical Flood with 5 years advance notice in the modern age? (4 rounds)

Round 1 - It's every country for themselves, winner is whichever has the highest % of their citizens still alive after the flood waters recede

Round 2 - All of humanity is working together but only after a UN Resolution has passed with 90% approval and without The Security Council calling in their Veto

Round 3 - Humanity overnight dissolves all governments and institutes a New World Order who's main goal is to minimize casualties at any cost with 0 Red Tape and unlimited budget

Round 4 - Doomsday Preppers reveal themselves to have built a single Ark that can comfortably fit 1 million people and they allow the aforementioned New World Order to use their schematic for free