{"raw_statement":[{"iden":"statement","content":"_DO YOU EXPECT ME TO FIND THIS OUT?_\n\n_WHAT BASE AND/XOR LANGUAGE INCLUDES string?_\n\n_DON'T BYTE OF MORE THAN YOU CAN CHEW_\n\n_YOU CAN ONLY DISTORT THE LARGEST OF MATHEMATICS SO FAR_\n\n_SAYING \"ABRACADABRA\" WITHOUT A MAGIC AND WON'T DO YOU ANY GOOD_\n\n_THE LAST STACK RUPTURES. ALL DIE. OH, THE EMBARRASSMENT!_\n\n_I HAVE NO ARRAY AND I MUST SCREAM_\n\n_ELEMENTS MAY NOT BE STORED IN WEST HYPERSPACE_"},{"iden":"input","content":"The first line of input data contains a single integer _n_ (1 ≤ _n_ ≤ 10).\n\nThe second line of input data contains _n_ space-separated integers _a__i_ (1 ≤ _a__i_ ≤ 11)."},{"iden":"output","content":"Output a single integer."},{"iden":"example","content":"Input\n\n4\n2 5 3 1\n\nOutput\n\n4"}],"translated_statement":[{"iden":"statement","content":"_DO YOU EXPECT ME TO FIND THIS OUT?_\n\n_WHAT BASE AND/XOR LANGUAGE INCLUDES string?_\n\n_DON'T BYTE OF MORE THAN YOU CAN CHEW_\n\n_YOU CAN ONLY DISTORT THE LARGEST OF MATHEMATICS SO FAR_\n\n_SAYING \"ABRACADABRA\" WITHOUT A MAGIC AND WON'T DO YOU ANY GOOD_\n\n_THE LAST STACK RUPTURES. ALL DIE. OH, THE EMBARRASSMENT!_\n\n_I HAVE NO ARRAY AND I MUST SCREAM_\n\n_ELEMENTS MAY NOT BE STORED IN WEST HYPERSPACE_\n\n输入数据的第一行包含一个整数 #cf_span[n]（#cf_span[1 ≤ n ≤ 10]）。\n\n输入数据的第二行包含 #cf_span[n] 个用空格分隔的整数 #cf_span[ai]（#cf_span[1 ≤ ai ≤ 11]）。\n\n请输出一个整数。\n\n"},{"iden":"input","content":"输入数据的第一行包含一个整数 #cf_span[n]（#cf_span[1 ≤ n ≤ 10]）。输入数据的第二行包含 #cf_span[n] 个用空格分隔的整数 #cf_span[ai]（#cf_span[1 ≤ ai ≤ 11]）。"},{"iden":"output","content":"请输出一个整数。"}],"sample_group":[],"show_order":[],"formal_statement":"Let $ n \\in \\mathbb{N} $, $ 1 \\leq n \\leq 10 $.\n\nLet $ a = (a_1, a_2, \\dots, a_n) $, where each $ a_i \\in \\mathbb{N} $, $ 1 \\leq a_i \\leq 11 $.\n\nOutput: $ \\bigoplus_{i=1}^n a_i $, the bitwise XOR of all elements in $ a $.","simple_statement":null,"has_page_source":false}