# def func(a,b):
# return (b/a)*(-1)
#
# a, b = map(int, input().split(' '))
# x = func(a,b)
#
# print('%.4f'%x)#강제로 4자리 까진 출력
# # print(round(x,4))#소수점 이하 4자리 전 0이면 거기서 끊기
# n = int(input())
# m=1
# for i in range(n):
# m = n*m
# n = n-1
# print(m)
# a, b, k =map(int, input().split(' '))
# num = b-a
# i = a
# while True:
# print(i,end =' ')
# i = i+num
# if i > k :
# break
# matplotlib, numpy, pyqt5, deep learning
# import matplotlib.pyplot as plt
#
# plt.plot([10, 20, 30, 40, 50])
# plt.plot([50, 40, 20, 10, 40])
#
# plt.show()
#
# '''
#
#
#
# '''