Write code in C++, C# or Python to solve the following problem: Instead of a regular Fibonacci number, you are supposed to calculate a special one as follows: F(n) = F(n-1)+ 2 * F(n-2) + 3 * F(n-3) As an example, if F(0) = F(1) = F(2) = 1, then we have: F(3) = F(2) + 2 * F(1) + 3 * F(0) = 1 + 2 + 3 = 6 F(4) = F(3) + 2 * F(2) + 3 * F(1) = 6 + 2 + 3 = 11 Given F(0), F(1), F(2), and N, your job is to calculate F(N). Input Format First number is F(0), second number is F(1), third number is F(2), and last number is N. Example input: 1 1 1 4 Constraints NA Output Format Print the Nth special Fibonnaci number. Example output: 11

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Write code in C++, C# or Python to solve the following problem:

Instead of a regular Fibonacci number, you are supposed to calculate a special one as follows:

F(n) = F(n-1)+ 2 * F(n-2) + 3 * F(n-3)

As an example, if F(0) = F(1) = F(2) = 1, then we have:

F(3) = F(2) + 2 * F(1) + 3 * F(0) = 1 + 2 + 3 = 6 F(4) = F(3) + 2 * F(2) + 3 * F(1) = 6 + 2 + 3 = 11

Given F(0), F(1), F(2), and N, your job is to calculate F(N).

Input Format

First number is F(0), second number is F(1), third number is F(2), and last number is N.

Example input: 1 1 1 4

Constraints

NA

Output Format

Print the Nth special Fibonnaci number.

Example output: 11

 

Sample Input 0

1
1
1
4

Sample Output 0

11
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