Solve power then 1/power and add them.

 #include<iostream> 

#include<math.h>

using namespace std; 

int main() 

{

float num;

float sum = 1, temp, c = 2; 

cin >> num;

while (c < num) 

{

temp = pow(c, c); 

sum += 1 / temp; 

c++;

}

cout << sum << endl; 

system("pause");

}