Let for some α∈R,f:R⟶R\alpha \in \mathbb{R}, f: \mathbb{R} \longrightarrow \mathbb{R}α∈R,f:R⟶R be a function satisfying f(x+y)=f(x)+2y2+y+αxyf(x+y)=f(x)+2 y^{2}+y+\alpha xyf(x+y)=f(x)+2y2+y+αxy for all x,y∈Rx, y \in \mathbb{R}x,y∈R. If f(0)=−1f(0)=-1f(0)=−1 and f(1)=2f(1)=2f(1)=2, then the value of ∑n=15(α+f(n))\sum_{n=1}^{5}(\alpha+f(n))∑n=15(α+f(n)) is :
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140
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170