#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP0(i,n)  FOR(i,0,n)
#define REP1(i,n)  FOR(i,1,n)

int main() {
    int a, b;
    cin >> a >> b;
    REP1(i,INT_MAX){
        REP0(j,i+1){
            int k = i - j;
            int x = ((1000 * j) / i + 5) / 10;
            int y = ((1000 * k) / i + 5) / 10;
            if(x == a && y == b){
              cout << i << endl;
              return 0;
            }
        }
    }
}