#include
using namespace std;
double f(double x)
{
\x09return x*x*x - x - 1;
}
int main()
{
\x09double left = 1;
\x09double right = 1.5;
\x09double mid;
\x09while(right-left > 1e-5)
\x09{
\x09\x09mid = (left + right) / 2;
\x09\x09if(f(mid)==0)
\x09\x09\x09break;
\x09\x09if(f(mid)*f(left)>0)
\x09\x09\x09left = mid;
\x09\x09else
\x09\x09\x09right = mid;
\x09}
\x09cout