Without using a calculator, compute $1002^2-502^2+298^2-202^2$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Without using a calculator, compute $1002^2-502^2+298^2-202^2$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
800000
Without using a calculator, compute $1002^2-502^2+298^2-202^2$.
train