If $D_{30}$ is the set of all divisors of $30, x, y\epsilon D_{30}$, we define $x+y=LCM(x, y), x\cdot y=GCD(x, y), x'=\displaystyle\frac{30}{x}$ and $f(x, y, z)=(x+y)\cdot (y'+z)$, then $f(2, 5, 15)$ is equal to

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