VTMO 2026 - Grade 9 - Semifinal - SET 08 - Self-study Question 2

Let p, q be distinct primes. Put $N=p^3q^4$ and $A=\{n/N:1\le n\le N,\ n\in\mathbb N,\ \gcd(n,pq)=1\}$. Find the sum of all elements of A.