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import java.util.Scanner;
public class MaxPairProduct {
int numberOfIntegers;
int biggest;
int bigger;
public MaxPairProduct(int size) {
numberOfIntegers = size;
}
public int getCount() {
return numberOfIntegers;
}
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
int n = s.nextInt();
MaxPairProduct mpp = new MaxPairProduct(n);
for (int i = 0; i<n; i++) {
mpp.newNumber(s.nextInt());
}
s.close();
System.out.println(mpp.getProduct());
}
public int getBiggest() {
return biggest;
}
public int getBigger() {
return bigger;
}
public void newNumber(int i) {
if (i > biggest) {
bigger = biggest;
biggest = i;
} else if (i == biggest) {
bigger = i;
} else if (i > bigger) {
bigger = i;
}
}
public long getProduct() {
if (numberOfIntegers == 0) {
return (long) 0;
} else if (numberOfIntegers == 1) {
return (long) biggest;
}
return (long) biggest * (long) bigger;
}
}
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