import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static int[] lengths = new int[3];
    static int[][] dp;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int[] plates = new int[4];
        for (int i = 0; i < 4; i++) {
            plates[i] = sc.nextInt();
        }
        dp = new int[3][31];
        long ans = Long.MAX_VALUE;
        for (int i = 1; i <= 30; i++) {
            lengths[0] = i;
            for (int j = i + 1; j <= 30; j++) {
                lengths[1] = j;
                for (int k = j + 1; k <= 30; k++) {
                    lengths[2] = k;
                    for (int[] arr : dp) {
                        Arrays.fill(arr, -1);
                    }
                    long tmp = 0;
                    for (int x : plates) {
                        tmp += dfw(2, x);
                    }
                    ans = Math.min(ans, tmp);
                }
            }
        }
        System.out.println(ans);
    }
    
    static int dfw(int idx, int v) {
        if (v < 0) {
            return Integer.MAX_VALUE / 2;
        }
        if (v == 0) {
            return 0;
        }
        if (idx < 0) {
            return Integer.MAX_VALUE / 2;
        }
        if (dp[idx][v] < 0) {
            dp[idx][v] = Math.min(dfw(idx - 1, v), dfw(idx, v - lengths[idx]) + 1);
        }
        return dp[idx][v];
    }
    
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}