ACM (TJU) : 2917


// http://acm.tju.edu.cn/toj/showp2917.html

#include<stdio.h>
#include<math.h>

int main ()
{
    double n;

    while( scanf("%lf", &n) && n >= 0 )
        printf("%.2lf\n", sqrt (n*2));

    return 0;
}
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