// #pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
// using mint = modint1000000007;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using T = tuple<int, int, int>;
using G = vector<vector<int>>;
#define rep(i, n) for (ll i = 0; i < (n); ++i)
#define rep2(i, a, b) for (ll i = a; i < (b); ++i)
#define rrep2(i, a, b) for (ll i = a-1; i >= (b); --i)
#define rep3(i, a, b, c) for (ll i = a; i < (b); i+=c)
#define rng(a) a.begin(),a.end()
#define rrng(a) a.rbegin(),a.rend()
#define popcount __builtin_popcount
#define popcountll __builtin_popcountll
#define fi first
#define se second
#define UNIQUE(v) sort(rng(v)), v.erase(unique(rng(v)), v.end())
#define MIN(v) *min_element(rng(v))
#define MAX(v) *max_element(rng(v))
#define SUM(v) accumulate(rng(v),0)
#define IN(v, x) (find(rng(v),x) != v.end())
template<class T> bool chmin(T &a,T b){if(a>b){a=b;return 1;}else return 0;}
template<class T> bool chmax(T &a,T b){if(a<b){a=b;return 1;}else return 0;}
template<class T> void printv(vector<T> &v){rep(i,v.size())cout<<v[i]<<" \n"[i==v.size()-1];}
template<class T> void printvv(vector<vector<T>> &v){rep(i,v.size())rep(j,v[i].size())cout<<v[i][j]<<" \n"[j==v[i].size()-1];cout<<endl;}
const ll dx[] = {0, 1, 0, -1};
const ll dy[] = {1, 0, -1, 0};
const ll dxx[] = {0, 1, 0, -1, 1, -1, 1, -1};
const ll dyy[] = {1, 0, -1, 0, 1, 1, -1, -1};
const ll LINF = 1001002003004005006ll;
const int INF = 1001001001;

ll gcd(ll a, ll b){ return (b ? gcd(b, a%b) : a); }
ll lcm(ll a, ll b){ return a/gcd(a, b)*b; }

// ax+by=gとなるg=gcd(a, b), x, yを求める拡張gcd
tuple<ll, ll, ll> extgcd(ll a, ll b) {
    if (b == 0) return {a, 1, 0};
    ll g, x, y;
    tie(g, x, y) = extgcd(b, a%b);
    return {g, y, x-a/b*y};
}


int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    vector<int> vs(4);
    rep(i, 4) cin >> vs[i];
    int ans = INF;
    rep2(i, 1, 31)rep2(j, i+1, 31)rep2(k, j+1, 31){
        int g = gcd(gcd(i, j), k);
        bool flag = false;
        for (auto v:  vs) if (v%g){
            flag = true;
            break;
        }
        if (flag) continue;
        int x = i/g, y = j/g, z = k/g;
        int res = 0;
        bool ok = true;
        for(auto v: vs){
            v /= g;
            int tmp = INF;
            for(int c = 0; c <= v/z; c++){
                for(int b = 0; b <= v/y; b++){
                    int d = v-c*z-b*y;
                    if (d < 0) break;
                    if (d%x) continue;
                    chmin(tmp, d/x+b+c);
                }
            }
            if (tmp == INF){
                ok = false;
                break;
            }
            res += tmp;
        }
        if (ok) chmin(ans, res);
    }
    cout << ans << endl;
    return 0;
}