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

typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<long long> VL;
typedef vector<vector<long long>> VVL;
typedef pair<int,int> P;
typedef tuple<int,int,int> tpl;

#define ALL(a)  (a).begin(),(a).end()
#define SORT(c) sort((c).begin(),(c).end())
#define REVERSE(c) reverse((c).begin(),(c).end())
#define EXIST(m,v) (m).find((v)) != (m).end()
#define LB(a,x) lower_bound((a).begin(), (a).end(), x) - (a).begin()
#define UB(a,x) upper_bound((a).begin(), (a).end(), x) - (a).begin()

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define RFOR(i,a,b) for(int i=(a)-1;i>=(b);--i)
#define RREP(i,n) RFOR(i,n,0)

#define en "\n"

constexpr double EPS = 1e-9;
constexpr double PI  = 3.1415926535897932;
constexpr int INF = 2147483647;
constexpr long long LINF = 1LL<<60;
constexpr long long MOD = 1000000007; // 998244353;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }

void trans(ll X, int *x, int *y){
    *x = 0; *y = 0;
    while(X%2 == 0){
        *x += 1;
        X /= 2;
    }
    while(X%5 == 0){
        *y += 1;
        X /= 5;
    }
}

void Main(){
    ll N = 1000000000;
    ll x1,x2; cin >> x1 >> x2;
    int sx=0,sy=0,gx=0,gy=0;
    trans(x1,&sx,&sy); trans(x2,&gx,&gy);

    REP(_,35){
        int dx = abs(sx-gx), dy = abs(sy-gy);
        if(dx>=dy){
            if(sx<gx){
                x1 *= 2;
                sx++;
            }
            else{
                x1 /= 2;
                sx--;
            }
        }
        else{
            if(sy<gy){
                x1 *= 5;
                sy++;
            }
            else{
                x1 /= 5;
                sy--;
            }
        }
        cout << x1 << endl;
        if(x1 == x2) break;
        cin >> x2;
        if(x1 == x2) break;
        trans(x2,&gx,&gy);
    }
    return;
}

int main(void){
    cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(0);cout<<fixed<<setprecision(15);
    int t=1; //cin>>t;
    REP(_,t) Main();
    return 0;
}