# n = int(input())
# data = []
#
# for i in range(n):
# name, y, m, d = input().split()
# data.append([name, int(y+m+d)])
#
# for i in range(n):
# for j in range(n-1):
# if data[j][1] < data[j+1][1]:
# t = data[j]
# data[j] = data[j+1]
# data[j+1] = t
# elif data[j][1] == data[j+1][1]:
# if data[j][0] < data[j+1][0]:
# t = data[j]
# data[j] = data[j+1]
# data[j+1] = t
#
# data.reverse()
#
# for j in range(n):
# print(data[j][0])
# def item():
# print('Hello')
#
# def plus(a, b):
# return a+b
#
# def minus(a, b):
# return a, b, a+b
##############################
# print(plus(10, 20))
# print(plus('Hello', 'World'))
#
# print(minus(10, 20))
# '''
# [] : list : edit, remove, fix, view
# () : tuple : view
# {} : dictionary : key, value
#
# '''
#
#
# n = int(input())
# data = []
#
# for i in range(n):
# x, y = map(int, input().split())
# data.append([x, y])
# r = 0
# for i in range(n):
# if data[i][0] > data[i][1]:
# t = data[i][0]
# else:
# t = data[i][1]
# r += t
#
# print(r)
# n = int(input())
# data = []
#
# for i in range(2):
# v = list(map(int, input().split()))
# data.append(v)
# r = 0
# for i in range(2):
# if data[i][0] > data[i][1]:
# t = data[i][0]
# else:
# t = data[i][1]
# r += t
#
# print(r)