和 25 - Problem

#22777. 和 25

Statistics

7 桁を読み（$0 \le \text{each digit} \le 9$；各桁は 0 以上 9 以下）、選んだ桁の集合の和が 25 になる方法数を数えてください。桁 0 は 0 ではなく 10 を表します。

次の入力は：

5 0 1 5 4 3 7

和が 25 になる異なる五つの選択を与えます：

        5 0       3 7
        5   1 5 4 3 7
        5 0 1 5 4
          0 1   4 3 7
          0   5   3 7

入力

一行に一桁の整数七つ。

出力

和が 25 になる部分集合の数を一行に出力。

入出力例

入力 1

5 0 1 5 4 3 7

出力 1

問題提供：Don Piele、1982。

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