#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int64_t A, B;
  cin >> A >> B;
  if (A * B > 0) {
    cout << -1 << '\n';
  } else {
    int64_t N = B;
    int res = 1;
    while (N != 0) {
      N = N * A + B;
      res++;
    }
    cout << res << '\n';
  }
  return 0;
}