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984. Equation with tg

Time Limit: 1 seconds
Memory Limit:65536KB
Points:100
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Требуется найти корень уравнение tg(x)=x+k, лежащий в интервале от 0 до Pi/2

Input

Вводится одно вещественное число k в диапазоне от 1.0 до 1000.0

Output

Выведите корень уравнения x с точностью до 6 знаков после десятичной точки

Sample

InputOutput
1
1.132268

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time generating 0.156 sec.
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