{"raw_statement":[{"iden":"statement","content":"<center>![image](https://espresso.codeforces.com/8f29dfb253ce9cd368f7ecc562d7be12eea631a3.png)</center>"},{"iden":"input","content":"The input consists of four lines, each line containing a single digit 0 or 1."},{"iden":"output","content":"Output a single digit, 0 or 1."},{"iden":"example","content":"Input\n\n0\n1\n1\n0\n\nOutput\n\n0"}],"translated_statement":[{"iden":"statement","content":"输入由四行组成，每行包含一个数字 0 或 1。\n\n输出一个数字，0 或 1。\n\n"},{"iden":"input","content":"输入由四行组成，每行包含一个数字 0 或 1。"},{"iden":"output","content":"输出一个数字，0 或 1。"}],"sample_group":[],"show_order":[],"formal_statement":"Let $ a, b, c, d \\in \\{0, 1\\} $ be the four input bits.\n\nOutput: $ f(a, b, c, d) \\in \\{0, 1\\} $, where $ f $ is an unknown Boolean function defined by the problem's unspecified logic.","simple_statement":null,"has_page_source":false}