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

#define x first
#define y second
#define IOS ios::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define int long long
#define mp(x, y) make_pair(x, y)
#define eb(...) emplace_back(__VA_ARGS__)
#define fro(i, x, y) for (int i = (x); i <= (y); i++)
#define pre(i, x, y) for (int i = (x); i >= (y); i--)

using PII = pair<int, int>;

const double pi = acos(-1.0);
const int N = 1e6 + 10;
const int mod = 998244353;

void solve()
{
    int a,b,c;
    cin>>a>>b>>c;
    int ans=0;
    ans+=a*2;
    int temp=0;
    if(c<=1);
    else
    {
        c=c/2;
        if(b==0)ans+=c*3;
        else {
        temp=min(c,b);
        ans+=5*temp+2*(b-temp);
        if(c>b)ans+=(c-b)*3;
        }
    }
    cout<<ans<<endl;
    return ;
}
signed main() {
    IOS;
    int T=1;
    //cin>>T;
    while(T--)
    {
        solve();
    }
    return 0;
}