# Python3 program to demonstrate working of heapq
from heapq import heappop, heappush, heapify
# Creating empty heap
heap = []
heapify(heap)
# Adding items to the heap using heappush
# function by multiplying them with -1
heappush(heap, -1 * 10)
heappush(heap, -1 * 30)
heappush(heap, -1 * 20)
heappush(heap, -1 * 400)
# printing the value of maximum element
print("Head value of heap : "+str(-1 * heap[0]))
# printing the elements of the heap
print("The heap elements : ")
for i in heap:
print(-1 * i, end = ' ')
print("
")
element = heappop(heap)
# printing the elements of the heap
print("The heap elements : ")
for i in heap:
print(-1 * i, end = ' ')