#include <iostream>
using namespace std;
int main(){
int n,s;
for (n;n<10000000;n++){
s+=4/(4*n^2+4*n-3);
}
cout<<s;
return 0;
#include <iostream>
using namespace std;
int main(){
int n,s;
for (n;n<10000000;n++){
s+=4/(4*n^2+4*n-3);
}
cout<<s;
return 0;
}