#include <bits/stdc++.h>
using namespace std;
int main()
{
    ios_base::sync_with_stdio(false);

    int a, b;
    cin >> a >> b;
    int res = 0;
    while(a != b) {
        if(a > b) {
            swap(a, b);
        }
        int najgolem_delitel = 1;
        int koren = sqrt(a);

        for(int i = 2; i <= koren; i++) {
            if(a % i == 0) {
                najgolem_delitel = a / i;
                break;
            }
        }
        b -= najgolem_delitel;
        res++;
    }

    cout << res << endl;
    return 0;
}