#include <iostream>
#include <cmath>
using namespace std;
int main()
{
double x,i;
x = 0;
for (i = 1; i < 50; i++)
x = x + (1 / pow(i, 3));
}
cout << x;
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
double x,i;
x = 0;
for (i = 1; i < 50; i++)
{
x = x + (1 / pow(i, 3));
}
cout << x;
}