Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
A Whatsapp group has members sending messages every day sharing about how each one's day was. Last week, 300 messages were sent by the members on Monday, 200 messages on Tuesday, 300 more messages on Wednesday than the previous day, and two times as many messages on Thursday as there were on Wednesday. Calculate the number of messages sent in the Whatsapp group after the four days.

### Response:
The total number of messages sent last week on Monday and Tuesday is 300+200 = <<300+200=500>>500 messages.
On Wednesday, the number of messages sent was 300 more than the previous day, which totals 200+300 = 500 messages.
In total, the number of messages sent in the three days is 500+500 = <<500+500=1000>>1000 messages.
On Thursday, the number of messages sent was two times as many as the number sent on Wednesday, which is 2*500 = <<2*500=1000>>1000 messages.
In the four days, the number of messages sent is 1000+1000 = <<1000+1000=2000>>2000 messages.
#### 2000