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+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+
+public class solution {
+    public static int maxProfit(ArrayList<Integer> stocks) {
+        int lowest = Integer.MAX_VALUE;
+        int maxProfit = 0;
+        int profit = 0;
+
+        for (int i = 0; i < stocks.size(); i++) {
+            if (stocks.get(i) < lowest) {
+                lowest = stocks.get(i);
+            }
+            profit = stocks.get(i) - lowest;
+            if (maxProfit < profit) {
+                maxProfit = profit;
+            }
+        }
+
+        return maxProfit;
+    }
+
+    public static void main(String[] args) throws IOException {
+        ArrayList<Integer> stocks = new ArrayList<Integer>();
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        String[] rawInput;
+        rawInput = br.readLine().split(" ");
+
+        for (int i = 0; i < rawInput.length; i++) {
+            stocks.add(Integer.parseInt(rawInput[i]));
+        }
+
+        System.out.println(maxProfit(stocks));
+    }
+}