#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

void solve() {
  boost::multiprecision::cpp_int n, b, now = 0;
  cin >> n >> b;
  if (b == 1) {
    cout << "0\n";
    return;
  }
  rep(i, b + 10) {
    if (now % b == 1) {
      cout << i << '\n';
      return;
    }
    now += n;
  }
  cout << "NaN\n";
  return;
}

int main() {
  std::cin.tie(nullptr);
  std::ios_base::sync_with_stdio(false);
  int T = 1;
  for (int t = 0; t < T; t++) {
    solve();
  }
  return 0;
}