#include <bits/stdc++.h>
using namespace std;
using lint = long long int;
using P = pair<int, int>;
using PL = pair<lint, lint>;
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
#define ALL(a)  (a).begin(),(a).end()
constexpr int MOD = 1000000007;
constexpr int INF = 2147483647;
void yes(bool expr) {cout << (expr ? "Yes" : "No") << "\n";}
void outnum(int two, int five) {
  int ans = 1;
  REP(i, two) ans *= 2;
  REP(i, five) ans *= 5;
  cout << ans << "\n";
  cout.flush();
}
int gettwo(int num) {
  int two = 0;
  while(num%2 == 0) {
    num /= 2;
    two++;
  }
  return two;
}
int getfive(int num) {
  int five = 0;
  while(num%5 == 0) {
    num /= 5;
    five++;
  }
  return five;
}
int main()
{
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int x1, x2;
  cin >> x1 >> x2;
  int two1 = gettwo(x1);
  int five1 = getfive(x1);
  int two2 = gettwo(x2);
  int five2 = getfive(x2);
  while(true) {
    if((abs(two1-two2) + abs(five1-five2))%2 == 0) {
      if(two1 < 7) two1++;
      else if(two1 > 7) two1--;
      else if(five1 < 9) five1++;
      else two1 += 2;
    } else {
      if(five1 == five2 && abs(two1-two2) == 1) two1 = two2;
      else if(two1 == two2 && abs(five1-five2) == 1) five1 = five2;
      else if(abs(two1-two2) > abs(five1-five2)) {
        if(two1 > two2) two1--;
        else two1++;
      } else {
        if(five1 > five2) five1--;
        else five1++;
      }
    }
    outnum(two1, five1);
    if(two1 == two2 && five1 == five2) break;
    cin >> x2;
    two2 = gettwo(x2);
    five2 = getfive(x2);
    if(two1 == two2 && five1 == five2) break;
  }
    
}