// program

#include<iostream.h>
#include<math.h>


void main() {

   int i,n,k;
   cout<<"n=";
   cin>>n;
   for(i=1;i<=n;i++) {
      k=(1/pow((i+1),2));
      i=i+k;
   }//end of for
   cout<<i;
} //end of main 

//end of program