#pragma region

#include <set>      //..........................................................
#include <map>      //..........................................................
#include <list>     //..........................................................
#include <queue>    //..........................................................
#include <stack>    //..........................................................
#include <cmath>    //..........................................................
#include <ctime>    //..........................................................
#include <cstdio>   //..........................................................
#include <vector>   //..........................................................
#include <string>   //..........................................................
#include <bitset>   //..........................................................
#include <cctype>   //..........................................................
#include <cstdlib>  //..........................................................
#include <cstring>  //..........................................................
#include <utility>  //..........................................................
#include <numeric>  //..........................................................
#include <complex>  //..........................................................
#include <sstream>  //..........................................................
#include <fstream>  //..........................................................
#include <iomanip>  //..........................................................
#include <cassert>  //..........................................................
#include <iostream> //..........................................................
#include <iterator> //..........................................................
#include <algorithm>//..........................................................

using namespace std;

using ll = long long;
using vi = vector<int>;
using vl = vector<ll>;
using vvi = vector<vi>;
using vvl = vector<vl>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;

const char alphabetl[26] = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
                            'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
                            'u', 'v', 'w', 'x', 'y', 'z'};
const char alphabetu[26] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
                            'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
                            'U', 'V', 'W', 'X', 'Y', 'Z'};
const double pi     = 3.141592653589793238462643383279502884197169;
const double napier = 2.718281828459045235360287471352662497757247;
static const double EPS = 1e-14;
static const ll INFLL = 1e18;
static const int INF = (1 << 30) - 1;
const int NM = 10100;//max index of array

#define SZ(x) ((int)(x).size())
#define rrep(i,n) for(int i=(n-1); i>=0; i--)
#define rreps(i,n) for(int i=(n); i>=0; i--)
#define RFOR(i,a,b) for(int i=a; i>(int)(b); i--)

#define ALL(x) (x).begin(),(x).end()
#define RALL(obj) (obj).rbegin(),(obj).rend()

#define PRINT(n) cout << n << "\n";
#define PRINT2(n, m) cout << n << " " << m << " "<< "\n";

#define IN(a, x, b) (a<=x && x<b)
#define pb push_back

unsigned int bitReverse(unsigned int data){
    data = ((data & 0x55555555) << 1)
        |  ((data & 0xAA555555) >> 1);
    data = ((data & 0x33333333) << 2)
        |  ((data & 0xCCCCCCCC) >> 2);
    data = ((data & 0x0F0F0F0F) << 4)
        |  ((data & 0xF0F0F0F0) >> 4);
    data = ((data & 0x00FF00FF) << 8)
        |  ((data & 0xFF00FF00) >> 8);
    data = (data << 16) | (data >> 16);
    return data;
}

const ll MAX_V = 1010;
const ll MAX_E = 2010;
ll V, E;
struct edge {
    ll from;
    ll to;
    ll cost;
};
edge ES[MAX_E];
ll d[MAX_V];

int gcd(int a,int b){return b?gcd(b,a%b):a;}
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};

void Main();
int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    cout << fixed << setprecision(15);
    Main();
    return 0;
}

#pragma endregion

/***
 *  yukicoder No.353 ヘイトプラス
 *  2019/09/02 GeckoCPPSonata
 ***/
void Main(){
    // Write your source code Here...
    ll A, B;
    cin >> A >> B;
    ll ans = 2e9;
    rrep(i,1e9) {
        if (A <= 0) ans--;
        else        A--;
        if (B <= 0) ans--;
        else        B--;
    }
    PRINT(ans)
}