A function f is defined recursively by f(1)=f(2)=1 and

f(n)=f(n-1)-f(n-2)+n

for all integers n \geq 3. What is f(2018) ?

**Answer Choices**

A. 2016

B. 2017

C. 2018

D. 2019

E. 2020

A function f is defined recursively by f(1)=f(2)=1 and

f(n)=f(n-1)-f(n-2)+n

for all integers n \geq 3. What is f(2018) ?

**Answer Choices**

A. 2016

B. 2017

C. 2018

D. 2019

E. 2020