题解 | #使徒袭来#

$\text{设三个数为}x,y,z,\mathrm{则}\backslash text\{设三个数为\}x,y,z,则$

$\mathrm{次}\mathrm{方}\mathrm{直}\mathrm{接}\mathrm{用}pow次方直接用pow$

include <bits/stdc++.h>
using namespace std;
int main()
{
    double n;
    scanf("%lf", &n);
    double m = pow(n, 1.0 / 3);
    printf("%.3lf\n", m + m + m);
    return 0;
}