import java.io.*; import java.util.*; import java.math.*; public class Main { InputStream is; PrintWriter out; String INPUT = ""; int MOD = 1000000007; int inf = 10000000; void solve() { int[] v = new int[4]; for(int i = 0; i < 4; i++){ v[i] = ni(); } int ans = inf; int[] dp = new int[100]; for(int a = 1; a <= 30; a++){ for(int b = a+1; b <= 30; b++){ for(int c = b+1; c <= 30; c++){ Arrays.fill(dp,inf); dp[0] = 0; for(int j = 0; j <= 30; j++){ dp[j+a] = Math.min(dp[j+a], dp[j]+1); } for(int j = 0; j <= 30; j++){ dp[j+b] = Math.min(dp[j+b], dp[j]+1); } for(int j = 0; j <= 30; j++){ dp[j+c] = Math.min(dp[j+c], dp[j]+1); } ans = Math.min(ans,dp[v[0]]+dp[v[1]]+dp[v[2]]+dp[v[3]]); } } } out.println(ans); } void run() throws Exception { is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes()); out = new PrintWriter(System.out); long s = System.currentTimeMillis(); solve(); out.flush(); if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms"); } public static void main(String[] args) throws Exception { new Main().run(); } private byte[] inbuf = new byte[1024]; private int lenbuf = 0, ptrbuf = 0; private int readByte() { if(lenbuf == -1)throw new InputMismatchException(); if(ptrbuf >= lenbuf){ ptrbuf = 0; try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); } if(lenbuf <= 0)return -1; } return inbuf[ptrbuf++]; } private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); } private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; } private double nd() { return Double.parseDouble(ns()); } private char nc() { return (char)skip(); } private String ns() { int b = skip(); StringBuilder sb = new StringBuilder(); while(!(isSpaceChar(b) && b != ' ')){ sb.appendCodePoint(b); b = readByte(); } return sb.toString(); } private char[] ns(int n) { char[] buf = new char[n]; int b = skip(), p = 0; while(p < n && !(isSpaceChar(b))){ buf[p++] = (char)b; b = readByte(); } return n == p ? buf : Arrays.copyOf(buf, p); } private char[][] nm(int n, int m) { char[][] map = new char[n][]; for(int i = 0;i < n;i++)map[i] = ns(m); return map; } private int[] na(int n) { int[] a = new int[n]; for(int i = 0;i < n;i++)a[i] = ni(); return a; } private int ni() { int num = 0, b; boolean minus = false; while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')); if(b == '-'){ minus = true; b = readByte(); } while(true){ if(b >= '0' && b <= '9'){ num = num * 10 + (b - '0'); }else{ return minus ? -num : num; } b = readByte(); } } private long nl() { long num = 0; int b; boolean minus = false; while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')); if(b == '-'){ minus = true; b = readByte(); } while(true){ if(b >= '0' && b <= '9'){ num = num * 10 + (b - '0'); }else{ return minus ? -num : num; } b = readByte(); } } private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); } static class ArrayUtils { public static void fill(double[][] array, double value) { for (double[] a : array) Arrays.fill(a, value); } public static void fill(double[][][] array, double value) { for (double[][] l : array) fill(l, value); } } }