How to avoid terraform previous ec2 to be destroy while creating new one using script

How to avoid terraform previous ec2 to be destroy while creating new one using script.For example i created one instance by using count=1 if I put count=2 it will only one instance can you please help me with this.I need to created number of count resources without destroy or depend on previous instance

provider “aws”{
profile = “default”
region = var.region

}

resource “aws_instance” “hello” {
count=2
ami = var.ami
instance_type = “t2.micro”

tags={
Name = “hello ${count.index}”
}

}