#include <bits/stdc++.h>
using namespace std;

long long gcd(long long N, long long X) {
    if (X == 0) return N;
    return gcd(X, N % X);
}

int main() {
    long long N, X;
    cin >> N >> X;
    cout << 3 * (N - gcd(N, X)) << endl;
}