#include <iostream>

using namespace std;

int main()
{
    int a, b, c, g, i, j;
    cin >> a >> b >> c;
    g = min(a, c);
    if (b % 2){
        i = b / 2 + 1;
        j = i;
    }
    else{
        i = b / 2 + 1;
        j = i - 1;
    }
    if (i <= a && j <= c)
        cout << i + j + b << endl;
    else
        if (g == a)
            cout << 4 * g << endl;
        else
            cout << g * 4 + 2 << endl;
    return 0;
}