// Author:她的店里只卖樱花
// Problem: No.1860 Magnets
// Contest: yukicoder
// URL: https://yukicoder.me/problems/no/1860
// Memory Limit: 512 MB
// Date: 2022-03-04 20:35:21
// Time Limit: 2000 ms

/**********************************************
*             她的店里只卖樱花                  *
***********************************************/
#include <iostream>
#include <algorithm>
#include <cstring>
#include <vector>
#include <cmath>
#include <unordered_map> 
#include <queue>
using namespace std;
#define fi first
#define se second
#define _for(i,b) for(int i=(0);i<(b);i++)
#define rep(i,a,b) for(int i=(a);i<=(b);i++)
#define per(i,b,a) for(int i=(b);i>=(a);i--)
#define mst(abc,bca) memset(abc,bca,sizeof abc)
#define ios_op cin.tie(0), cout.tie(0), ios::sync_with_stdio(0);
typedef priority_queue<int, vector<int>, greater<int> > PQ;
typedef long long LL;
typedef pair<int, int> PII;
typedef unsigned long long ULL;

const int Inf = 0x3f3f3f3f, Null = 0x80808080;
const double eps=1e-6;
const double PI=acos(-1.0);
const int MOD = 1e9 + 7;
const int N = 100010;

template <typename T> void inline read(T &x) {
    int f = 1; x = 0; char s = getchar();
  while (s < '0' || s > '9') { if (s == '-') f = -1; s = getchar(); }
    while (s <= '9' && s >= '0') x = x * 10 + (s ^ 48), s = getchar();
    x *= f;
}

template <typename T> void print(T x) {
    if (x < 0) { putchar('-'); print(x); return ; }
    if (x >= 10) print(x / 10);
    putchar((x % 10) + '0');
}

int main (){
   	LL n, m;
   	cin >> n >> m; 
   	LL a = max(n, m), b = n + m - a; 
   	if(a == 0)
   		cout << 0 << endl;
   	else 
   	cout << (LL)b * 2 + (a - b) * 2 - 1 << endl; 
    return 0;
}