def fibonacciModified(t1, t2, n):
    if n==1:
        return t1;
    elif n==2:
        return t2;
    else:
        nt1 = fibonacciModified(t1, t2, n-2)
        nt2 = fibonacciModified(t1, t2, n-1)
        return nt1 + nt2*nt2;