#include <algorithm>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <iostream>
#include <map>
#include <memory>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <utility>
#include <vector>
 
using namespace std;
 
#define sz size()
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(c) (c).begin(), (c).end()
#define rep(i,a,b) for(int i=(a);i<(b);++i)
#define clr(a, b) memset((a), (b) ,sizeof(a))
 
#define MOD 1000000007

int main(){
  int a,b;
  cin>>a>>b;
  int la = max(0,10*a-5);
  int ha = min(1000,10*a+5);
  int lb = max(0,10*b-5);
  int hb = min(1000,10*b+5);
  int mn = 1000000;
  rep(i,0,1000){
    rep(j,0,1000){
      if(la*(i+j)<=1000*i&&1000*i<ha*(i+j)){
        if(lb*(i+j)<=1000*j&&1000*j<hb*(i+j)){
          mn = min(mn,i+j);
        }
      }
    }
  }
  cout << mn << endl;
  return 0;
}