#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
typedef long long ll;

int main(){
  int A, B;
  cin >> A >> B;
  int ans = 99999;
  for(int a = 0; a <= 200; a++) {
    for(int b = 0; b <= 200; b++) {
      if(a==0 && b==0) continue;
      bool ok = true;
      ok &= A == (100 * a * 10 / (a + b) + 5) / 10;
      ok &= B == (100 * b * 10 / (a + b) + 5) / 10;
      if(ok) ans = min(ans, a + b);
    }
  }
  cout << ans << endl;
  return 0;
}