#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <iostream>
#include <queue>
#include <list>
#include <stack>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;

int calc(int a, int b){
  int ret = a/b;
  if(5*b <= 10*(a%b)) ret++;
  return ret;
}

int main(){
  int A, B;
  cin >> A >> B;
  REP(num,1,1000){
    REP(a,1,num+1){
      int b = num-a;
      if(A == calc(100*a,num) && B == calc(100*b,num)){
        cout << num << endl;
        return 0;
      }
    }
  }
  return 0;
}