#include<bits/stdc++.h>
using namespace std;

long long pow_long(long long a, long long b) {
    long res = 1;
    while (b > 0) {
        if ((b & 1) == 1) {
            res *= a;
        }
        b >>= 1;
        a *= a;
    }
    return res;
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(0);
    long long n;
    cin >> n;
    long long ans = n + 1;
    for (long long i = 1; i * i < n; ++i) {
        if (n % i != 0) continue;
        long long s = n / i;
        if (i < s - 1) {
            ans = min(ans, s - 1);
        }
        long long p = i + 1;
        long long l = p * p + p + 1;
        for (int j = 3; l <= s; ++j, l = l * p + 1) {
            long long lower = i, upper = (long long)pow(s, 1.0 / (j - 1)) + 2;
            while (lower + 1 < upper) {
                long long m = (lower + upper) / 2;
                long long sum = (pow_long(m, j) - 1) / (m - 1);
                if (sum == s) {
                    ans = min(ans, m);
                    break;
                }
                if (sum < s) {
                    lower = m;
                }
                else {
                    upper = m;
                }
            }
        }
    }
    cout << ans << '\n';
    return 0;
}