// WA
#include<bits/stdc++.h>
using namespace std;
using ull = unsigned long long;
constexpr int X=85344,sqrtX=292;

ull solve(ull v){
  ull ng=1817123,ans=0;
  while(ng-ans>1){
    ull mid=(ans+ng)/2;
    if(mid*(mid+1)*(2*mid+1)/6<=v)ans=mid;
    else ng=mid;
  }
  return ans;
}

vector<int> NG={2, 3, 6, 7, 8, 11, 12, 15, 18, 19, 22, 23, 24, 27, 28, 31, 32, 33, 43, 44, 47, 48, 60, 67, 72, 76, 92, 96, 108, 112, 128};

int main(){
  ull B,W;
  cin>>B>>W;
  if(B>W)swap(B,W);
  ull ans=0;
  ans=solve(B+W);
  for(auto i:NG){
    if(i==B){
      ans=solve(B+W-1);
    }
  }
  cout<<ans<<'\n';
}