# include <bits/stdc++.h>
# define endl "\n"
using namespace std;

typedef long long int ll;

void solve() {
	int a, b;
	cin >> a >> b;
	cout << 2 * min(a, b) << endl;
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
# ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
# endif
	// int t;
	// cin >> t;
	// while (t--)
	solve();
	return 0;
}