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def HeadAdjust(nums, k, n):    nums[0] = nums[k]    i = 2*k    while i <= n:        if i < n and nums[i] > nums[i+1]:            i += 1        if nums[0] <= nums[i]:            break        else:            nums[k] = nums[i]            k = i        i = i*2    nums[k] = nums[0]def minHead(nums, n, x):    for i in range(n//2, -1, -1):        HeadAdjust(nums, i, n)if __name__ == '__main__':    nums = input().split()    nums = [int(it) for it in nums]    n = nums[0]    m = nums[1]    x = nums[2]    xc = input().split()    xc = [int(it) for it in xc]    xc.insert(0, 0)    minHead(xc, n, x)    for _ in range(m):        xc[1] += x        HeadAdjust(xc, 1, n)    print(xc[1])

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