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)

#C - Guess The Number
n,m = list(map(int,input().split()))
tmp = []
s = []
c = []
flg = False
counter = 0
ans = 0
tmp = [input() for i in range(m)]
for i in tmp:
    i.split()
    s.append(i[0])
    c.append(i[2])
if(n ==3):
  for j in range(100,1000):
    if(flg == True):
      break
    list_j = list(str(j))
    counter = 0
    for k in s:
        if(list_j[int(k)-1] != c[counter]):
          break
        if(list_j[int(k)-1] == c[counter]):
          counter += 1
          if(counter == len(c)):
            flg = True
            break
    if(flg == True):
      ans = j
      break
if(n ==2):
  for j in range(10,100):
    if(flg == True):
      break
    list_j = list(str(j))
    counter = 0
    for k in s:
        if(list_j[int(k)-1] != c[counter]):
          break
        if(list_j[int(k)-1] == c[counter]):
          counter += 1
          if(counter == len(c)):
            flg = True
            break
    if(flg == True):
      ans = j
      break
if(n ==1):
  for j in range(0,10):
    if(flg == True):
      break
    list_j = list(str(j))
    counter = 0
    for k in s:
        if(list_j[int(k)-1] != c[counter]):
          break
        if(list_j[int(k)-1] == c[counter]):
          counter += 1
          if(counter == len(c)):
            flg = True
            break
    if(flg == True):
      ans = j
      break

if(flg == True):
    print(ans)
else:
    print('-1')