#include <iostream.h>
#include <stdio.h>
#include <fstream.h>
ifstream f("equa.in");
#define cin f
int main()
{
    int c;
    int i;
    float x;
    int max;
    while(cin>>c)
    {
        max=(5000>(int)(100000/c)) ? (int)(100000/c) : 5000;
        for(i=0;i<=max;i++)
        {
            float j=(float)i/1000;
            if(j*j*j+j*c==100 )
            break;
        }
        x=(float)((float)i/1000);
        printf("%0.3f\n",x);
    }
}      

评论