#include <bits/stdc++.h>
using namespace std;

signed main(){
  int A, B; cin >> A >> B;
  for( int d = 1; ; ++d )
    for( int i = 0; i <= d; ++i )
      if( ( 100 * i + d / 2 ) / d == A and ( 100 * ( d - i ) + d / 2 ) / d == B )
        cout << d << endl, exit( 0 );
  return 0;
}