#include<stdio.h>
#include<stdlib.h>
double fun(int m);
int main()
{
int n=2000;
printf("\n the result is %lf\n",fun(n));
}
double fun(int m)
{
double y=0,d;
int i;
for(i=100;i<=m;i=i+100)
{
d=(double)i*(double)i;
y+=1.0/d;
}
return (y);
}