#include <bits/stdc++.h>
using namespace std;
using pint = pair<int, int>;
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define REP(i, n) FOR(i,0,n)
#define dbg(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ") " << __FILE__ << endl;

pint fac(int x)
{
    int i2 = 0, i5 = 0;
    while (x % 2 == 0) x /= 2, i2++;
    while (x % 5 == 0) x /= 5, i5++;
    return pint(i2, i5);
}

int val(pint p)
{
    int ret = 1;
    REP(_, p.first) ret *= 2;
    REP(_, p.second) ret *= 5;
    return ret;
}

int main()
{
    int x1, x2;
    cin >> x1 >> x2;
    pint p1 = fac(x1), p2 = fac(x2);
    int cnt = 0;
    while (true)
    {
        if (p1 == p2) return 0;
        int dist = abs(p1.first - p2.first) + abs(p1.second - p2.second);

        if (dist == 1) p1 = p2;
        else if (dist % 2 == 0)
        {
            if (p1 == pint(9, 9)) p1 = pint(7, 9);
            else if (p1 == pint(7, 9)) p1 = pint(9, 9);
            else if (p1.second < 9) p1.second++;
            else if (p1.first == 8) p1.first--;
            else p1.first++;
        }
        else
        {
            if (p1.first <= p2.first + 1 and p1.first < 9) p1.first++;
            else if (p1.second <= p2.second + 1 and p1.second < 9) p1.second++;
            else if (p1.second - 2 > p2.second) p1.second--;
            else if (p1.first - 2 > p2.first) p1.first--;
            else exit(8);
        }
        
        cnt++;
        if (cnt >= 36) return 0;
        cout << val(p1) << endl;
        if (p1 == p2) return 0;
        int x;
        cin >> x;
        p2 = fac(x);
    }
}