#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int a,b;cin>>a>>b;
  int z=1e9;
  auto rdiv=[](int p,int q)->int{
    return p/q + (2*(p%q) >= q);
  };
  rep(x,1000){
    rep(y,1000){
      if(x==0&&y==0)continue;
      if(rdiv(100*x,x+y)==a&&rdiv(100*y,x+y)==b){
        //cout<<x<<" "<<y<<" "<<rdiv(100*x,x+y)<<" "<<a<<" "<<rdiv(100*y,x+y)<<" "<<b<<" "<<z<<endl;
        z=min(z,x+y);
      }
    }
  }
  cout<<z<<endl;
}