#include <stdio.h>
#include <stdlib.h>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
int main(int argc, char *argv[]) {
int n,i;
double s;
printf("n=");
scanf("%d",&n);
for (i=1,s=1;i<=n;i++)
s=s+s/(i*i);
printf("s=%lf",s);
return 0;
}