#define _GLIBCXX_DEBUG
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define ALL(v) v.begin(), v.end()
typedef long long ll;

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

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  
  int a,b;
  cin>>a>>b;
  
  if(a-b>0) cout<<a+a-1<<endl;
  else if(b-a>0) cout<<b+b-1<<endl;
  else cout<<a+b<<endl;
  
  return 0;
}
#include<iostream>
#include<math.h>
#include<bits/stdc++.h>
#define ll long long int
#define hell 1000000007LL
using namespace std;
ll power(ll x, ll y){ 
    if(y==0)
     return 1;
    else
    {
        ll p=power(x,y/2);
        if(y%2==0)
         return (p*p)%hell;
        else
        return (x*((p*p)%hell))%hell;
    }}
ll gcd(ll x,ll y)
{
    if(y==0)
     return x;
    else
    return gcd(y,x%y);
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.precision(20);
    ll a,b;
    cin>>a>>b;
    cout<<max(max(a+b,2*a-1),2*b-1);}