B'You have to restore the wall. The wall consists of N pillars of bricks, the height of the i -th pillar is initially equal to h_{i} , the height is measured in number of bricks. After the restoration all the N pillars should have equal heights. You are allowed the following operations: You cannot create additional pillars or ignore some of pre-existing pillars even if their height becomes 0 . What is the minimal total cost of restoration, in other words, what is the minimal total cost to make all the pillars of equal height? The first line of input contains four integers N , A , R , M ( 1 <= N <= 10^{5} , 0 <= A, R, M <= 10^{4} ) -- the number of pillars and the costs of operations. The second line contains N integers h_{i} ( 0 <= h_{i} <= 10^{9} ) -- initial heights of pillars. Print one integer -- the minimal cost of restoration. '...