Level
2

$a\oplus b=\frac { 1 }{ \frac { 1 }{ a } +\frac { 1 }{ b } }$

$\sum _{ k=2 }^{ 7 }{ (2k^{ 2 }) } \oplus \prod _{ n=3 }^{ 5 }{ ({ n }^{ 2 }-2n) }$

- Round up to nearest integer

The answer is 157.

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