import sys
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
INF = 2**63-1
mod = 998244353
from collections import Counter
n = ii()

def euler_phi(n):
    res = n
    x = 2
    while x*x <= n:
        if n % x == 0:
            res = res // x * (x-1)
            while n % x == 0:
                n //= x
        x += 1
    if n > 1:
        res = res // n * (n-1)
    return res

ans = n * euler_phi(n)

if ans > 1000:
    print("1000+")
else:
    print(ans)