ata Storage and Representation

$6.$ Consider the following snippet of code.

LOAD R$1,$ #$400$

ADD R$2,$ R$1,[$R$1]$

ADD R$1,$ R$2,[$R$1,$ #$2]$

PUSH PC

LOAD R$1,700$

j$.$ What is the value in R$1$ after the third line is executed?