Golu loves prime numbers . He wants to do something new with prime numbers. So Molu gives him a number and asks him to minmum number of prime numbers required such that their sum is equal to given number. This task is very diffcult for Golu so he asks you for your help.
Now your task is that you are given a number and you have to find minimum number of prime numbers required such that their sum is equal to given number.
2<=N<=1000000
for N=2 one prime number (2)
for N=4 two prime numbers (2 + 2)