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

int main()
{
	int A, B;
	cin >> A >> B;

	int N = A + B;
	int flag = 0;
	if( B > A ) flag = 1;
	int ans = 0;
	for( int i = 0; i < N; i++ ) {
		if( A <= 0 || B <= 0 ) break;
		if( flag ) B--;
		else A--;
		ans ++;
		flag = 1 - flag;
	}

	cout << ans << endl;
}