#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>



using namespace std;




int main() {
  
	long long int a,b,n,k;
	cin>>a>>b;
	if(a<b)swap(a,b);
	int t=a-b;
	a*=2;
	a-=t;
	cout<<a<<endl;

    return 0;
}