#include
using namespace std;
int main(){
int n, j=0;
cin>>n;
unsigned long long arr[3*n+1];
unsigned long long arrb[n];
arr[0]=0; arr[1]=1;
for (int i=2; i<3*n+1; ++i) arr[i]=arr[i-1]+arr[i-2];</p>
for (int i=3; i<3*n+1; i+=3, ++j) arrb[j]=arr[i];</p>
for (int i=0; i
}