#include <bits/stdc++.h>
#include <atcoder/all>
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/multiprecision/cpp_int.hpp>
namespace mp = boost::multiprecision;
using Bint = mp::cpp_int;
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    ll n;
    cin >> n;
    ll ret = n;
    ll N = n;
    for(int p=2;p<=n;p++) {
        if(n%p==0) {
            while(n%p==0) n /= p;
            ret /= p;
            ret *= p-1;
        }
    }
    dbg(ret);
    if(N==1) {
        cout << 1 << endl;
        return 0;
    }
    for(int i=1;i<=ret;i++) {
        if(ret%i==0) {
            ll res = pow_mod(10,i,N);
            if(res==1) {
                cout << i << endl;
                return 0;
            }
        }
    }
    return 0;
}