#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll GCD(ll x,ll y){
    if(y == 0) return x;
    else return GCD(y,x%y);
}
const int MOD = 1000000007;

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