I'm Really Not a Liar

"I can calculate addition, subtraction, multiplication and division within ten digits in three seconds. Do you believe it?" "Hmph! Let me ask you, 3542×6543 = how much?" "Thirty-five million six hundred and eighty-six thousand seven hundred and sixty-six!" "Fog*? Really?" "Ding! Congratulations to the host, your performance made one person believe it. The current progress is 100/100." "Ding! Congratulations to the host, you have obtained the skill Lightning Abacus Mental Arithmetic." As long as you believe, what is false will become true! Lu Lin said that my system is so awesome! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.