Simple calculation 3 * 7 * 47 * 2 * 89 * 53 * 4

Simple calculation:
3*7*47*2*89*53*4
=47*53*4*89*42
=(50-3)(50+3)*4*(90-1)*42
=(2500-9)*4*(3780-42)
=(10000-36)*3738
=37380000-36*3738
=37380000-134568
=37245432

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