Problem:
Score : 100 points

Problem Statement

Takahashi wants to print a document with N pages double-sided, where two pages of data can be printed on one sheet of paper.

At least how many sheets of paper does he need?

Constraints

N is an integer.

1 \leq N \leq 100

Input

Input is given from Standard Input in the following format:

N

Output

Print the answer.

Sample Input 1

5

Sample Output 1

3

By printing the 1-st, 2-nd pages on the 1-st sheet, 3-rd and 4-th pages on the 2-nd sheet, and 5-th page on the 3-rd sheet, we can print all the data on 3 sheets of paper.

Sample Input 2

2

Sample Output 2

1

Sample Input 3

100

Sample Output 3

50

Solution in Python (3.4.3) (judge verdict: Runtime Error)

import numpy as np

A = np.empty(9)
b = np.empty(10)
place = ''

for i in range(0,7,3):
  A[i], A[i+1], A[i+2] = map(int,input().split())

N = int(input())

for n in range(N):
  b[n] = int(input())
  for j in range(9):
  	if b[n] == A[j]:
  		place = place + ' ' + str(j)

ans='No'

for i in range(0,7,3):
  if str(i) and str(i+1) and str(i+2) in place:
  	ans = 'Yes'

for i in range(3):
  if str(i) and str(i+3) and str(i+6) in place:
  	ans = 'Yes'

if '0' and '4' and '8' in place:
	ans = 'Yes'
if '2' and '4' and '6' in place:
	ans = 'Yes'

print(ans)