#import sys;input = lambda: sys.stdin.readline().rstrip()
#CF706-E-2500
#from functools import lru_cache
#@lru_cache(maxsize = None)
#import numpy as np
#import heapq
#from collections import deque
#from collections import Counter as cnt
#from collections import defaultdict as ddc
#from math import factorial as fct
#from math import gcd
#from bisect import bisect_left as bsl
#from bisect import bisect_right as bsr
#from itertools import accumulate as acc
#from itertools import combinations as cmb
#from itertools import permutations as pmt
#from itertools import product as prd
#from functools import reduce as red
#import sys
#sys.setrecursionlimit(10**9)  #再帰を多く使う(デフォルトは1000)
#from sys import stdout
#flush = stdout.flush()

n = int(input())
if n%2:
    ans = 1
else:
    ans = n//2+1
    
print(ans)