Consider the network shown in the figure below, with three links, each with a transmission rate of $1Mbps,$ and a propagation delay of $1$msec per link. Assume the length of a packet is $2000$ bits.

What is the end$-$end delay of a packet from when it first begins transmission on link $1,$ until is it received in full by the server at the end of link $3.$ Assume store$-$and forward packet transmission.