#include <bits/stdc++.h>   int main() {     long n;     long m;     std::cin >> n >> m;     long a = 0, b = 0, c = 0, d = 0;     while (!(n % 2)) {       n = n / 2;       a++;     }     while (!(n % 3)) {       n = n / 3;       b++;     }     while (!(m % 2)) {       m = m / 2;       c++;     }     while (!(m % 3)) {       m = m / 3;       d++;     }     if ((n != m) || (a > c) || (b > d)) {       std::cout << -1;     } else {       std::cout << (c + d) - (a + b);     }     return 0;   }   