#include <bits/stdc++.h>
#define int long long
  
using namespace std;
  
#define rep(i,n) REP(i,0,n)
#define REP(i,s,e) for(int i=(s); i<(int)(e); i++)
#define repr(i, n) REPR(i, n, 0)
#define REPR(i, s, e) for(int i=(int)(s-1); i>=(int)(e); i--)
#define pb push_back
#define all(r) r.begin(),r.end()
#define rall(r) r.rbegin(),r.rend()
#define fi first
#define se second
  
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
 
const int INF = 1e9;
const ll MOD = 1e9 + 7;
double EPS = 1e-8;

const int MAX_M = 62;

int dp[MAX_M];

template<typename T> T chmax(T& a, const T& b){return a = (a > b ? a : b);}
template<typename T> T chmin(T& a, const T& b){return a = (a < b ? a : b);}

signed main(){
    constexpr int N = 4;
    vector<int> v(N);
    rep(i, N) cin >> v[i];
    int ans = INF;
    REP(A, 1, 31) REP(B, 1, A) REP(C, 1, B) {
        rep(i, MAX_M) dp[i] = INF;
        dp[0] = 0LL;
        rep(i, 31) {
            chmin(dp[i+A], dp[i] + 1);
            chmin(dp[i+B], dp[i] + 1);
            chmin(dp[i+C], dp[i] + 1);
        }
        int tmp = 0;
        rep(i, N) tmp += dp[v[i]];
        chmin(ans, tmp);
    }
    cout << ans << endl;
    return 0;
}