#include
int main()
{
double data[100];
double sum = 0.0;
int i = 0;
double sign = 1.0;
printf("\nYou entered the values:\n");
for(i = 1 ; i<=100 ; i++){
data[i-1] = 1.0/(2*i*(2*i+1)*(2*i+2));
}
for(i = 0 ; i<100 ; i++)
{
sum += sign*data[i];
sign = -sign;
}
printf("\nResult is %.4lf\n", 4.0*sum+3);
}