#include <bits/stdc++.h>
using namespace std;
using namespace chrono;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif

int main()
{
    uint64_t n, b;
    cin >> n >> b;

    if (gcd(n, b) != 1)
    {
        cout << "NaN" << endl;
        return 0;
    }

    using mint = modint;
    mint::set_mod(b);

    cout << mint(n).inv().val() << endl;

    return 0;
}