#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcountll
#define ll long long
#define mp make_pair
#define f first
#define s second
#define Time (double)clock()/CLOCKS_PER_SEC
#define debug(x) std::cout << #x << ": " << x << '\n';

vector <int> c;

const int N = 5;
int a[N];

void gen(int i, int sum) {
    if (i == 5) {
        if (sum >= 0) {
            c.app(sum);
        }
        return;
    }   

    for (int f = -2; f <= 1; ++f) {
        gen(i + 1, sum + a[i] * f);
    }   
}

int b[N];

signed main() {
    #ifdef HOME
    freopen("input.txt", "r", stdin);
    #else
    #define endl '\n'
    ios_base::sync_with_stdio(0); cin.tie(0);
    #endif

    for (int i = 0; i < 5; ++i)
        cin >> a[i];

    gen(0, 0);
    
    /*
    for (auto e : c)
        cout << e << ' ';
    cout << endl;
    */

    int ans = 0;
    for (int x : c) {
        for (int y : c) {
            for (int z : c) {

                b[0] = a[0] - x;
                b[1] = a[1] - x - y;
                b[2] = a[2] - x - y - z;
                b[3] = a[3] - y - z;
                b[4] = a[4] - z;

                int mn = 0;
                for (int i = 0; i < N; ++i)
                    mn = min(mn, b[i]);
                if (mn < 0)
                    continue;

                int add = min(b[3] + b[1], min(b[0], b[4]));
                ans = max(ans, x + y + z + add);

            }
        }   
    }   
    cout << ans << endl;
}