Fibonacci

#include <iostream>

using namespace std;

int main()
{
setlocale(LC_ALL, "rus");

unsigned long int n, i, mas[3] = { 0 };

cout<<"N->";
cin>>n;
mas[0] = mas[1] = 1;
//cout<<mas[0]<<'\t'<<mas[1]<<'\t';
for (i = 2; i<n; i++)
{
mas[2] = mas[1] + mas[0];
mas[0] = mas[1];
mas[1] = mas[2];
}
cout<<"F="<<mas[2] ;
cout<<'\n';
system("pause");
return 0;
}