@@ -0,0 +1,32 @@
+package B1;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.StringTokenizer;
+
+public class Boj_34534_FormaStraight {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        boolean[] used = new boolean[10];
+        int min = Integer.MAX_VALUE;
+
+        for (int i = 0; i < 5; i++) {
+            used[Integer.parseInt(st.nextToken())] = true;
+        }
+
+        for (int i = 1; i <= 5; i++) {
+            int cnt = 0;
+            for (int j = 0; j < 5; j++) {
+                if (!used[j + i]) {
+                    cnt++;
+                }
+            }
+            min = Math.min(min, cnt);
+        }
+
+        System.out.print(min);
+    }
+}