Description: DO YOU EXPECT ME TO FIND THIS OUT? WHAT BASE AND/XOR LANGUAGE INCLUDES string? DON'T BYTE OF MORE THAN YOU CAN CHEW YOU CAN ONLY DISTORT THE LARGEST OF MATHEMATICS SO FAR SAYING "ABRACADABRA" WITHOUT A MAGIC AND WON'T DO YOU ANY GOOD THE LAST STACK RUPTURES. ALL DIE. OH, THE EMBARRASSMENT! I HAVE NO ARRAY AND I MUST SCREAM ELEMENTS MAY NOT BE STORED IN WEST HYPERSPACE Input Format: The first line of input data contains a single integer n (1 ≤ n ≤ 10). The second line of input data contains n space-separated integers ai (1 ≤ ai ≤ 11). Output Format: Output a single integer. Note: None