Let `alpha^k` where `k=0, 1,2,.... , 2013` are `2014^(th)` roots of unity. If `z_1 and z_2` be any two complex number such that `|z_1|=|z_2|=1/sqrt2014` , then the value of `sum_(k=0)^2013 |z_1+alpha^k z_2|^2` , is equal to