#include <iostream>

using namespace std;

int main() {
    float b1 = -1, b2 = 1, b;
    int n;
    cout << "n = "; cin >> n;
    for (int i = 3; i <= n; i++) {
        b = 3 * b2 - 2 * b1;
        b1 = b2; b2 = b;
        cout << "b" << i << " = " << b << endl;
    }
}