Peter has recently been fascinated by numbers that can be expressed in the form f(a,b,c)=a(b−c)^3+b(c−a)^3+c(a−b)^3 for some integers a,b and c. He thinks that we should use this system to do arithmetic in future. How many positive integers N≤1000 can be expressed in the form of f(a,b,c)?

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f(a,b,c)=a(b−c)^3+b(c−a)^3+c(a−b)^3

Oh! Peter should try it first.

This is a lie.

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