Four Square

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문제 설명

예제2

문제

Inspired by a Piet Mondrian painting, you want to make a four-pane window out of four colored rectangles of glass. You are given the sizes of the four panes of glass. Can you arrange them into a square? You may rotate the panes. The panes should cover the entire square without overlap.

입력

The input consists of exactly four lines. Each of the four lines contains two integers $w$ and $h$ ( $1 \le w,h \le 1\\,000$ ), representing the width and height of one of the four rectangular panes of glass.

출력

Output a single integer, which is $1$ if the four panes can be arranged to form a square, and $0$ otherwise.