#include <bits/stdc++.h>
#include <iomanip>
using namespace std;
#define reps(i,s,n) for(int i = s; i < n; i++)
#define rep(i,n) reps(i,0,n)
#define Rreps(i,n,e) for(int i = n - 1; i >= e; --i)
#define Rrep(i,n) Rreps(i,n,0)
#define ALL(a) a.begin(), a.end()
#define fi first
#define se second
typedef long long ll;
typedef vector<ll> vec;
typedef vector<vec> mat;

ll N,M,H,W,Q,K,A,B;
string S;
const ll MOD = 998244353;
//const ll MOD = (1e+9) + 7;
typedef pair<ll, ll> P;
const ll INF = (1LL<<60);

int main() {
    cin>>A>>B;
    bool zero = false;
    N = 0;
    ll ans = 0;
    while(!zero){
        ++ans;
        N = A * N + B;
        if(abs(N) > ll(1e+9) + 10){
            cout<<-1<<endl;
            return 0;
        }
        if(N == 0) zero = true;
    }
    cout<<ans<<endl;
}