2011 xIMC keystage2-EMIC individual Question 3

A girl computes $\frac{1+2}{3}+\frac{4+5}{6}+\cdots+\frac{2011+2012}{2013}$. A boy computes $1+\frac12+\frac13+\cdots+\frac1{671}$. Find the sum of their answers.