import sys
sys.setrecursionlimit(10 ** 6)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LC(): return list(input())
def IC(): return [int(c) for c in input()]
def MI(): return map(int, sys.stdin.readline().split())
INF = float('inf')
def solve():
    N = II()
    if(N==2):
        print(2)
    elif(N%2 == 1):
        print(1)
    else:
        print(N//2+1)
    return
solve()