A commercial property developer leases N office suites across executive suites and standard suites. An executive suite yields a monthly rental income of $3,200, and a standard suite yields $1,800. The total monthly rental income from the N suites is $83,000. The number of executive suites, e, and standard suites, s, are positive integers such that e + s = N. If e is a prime number and the difference s - e is a multiple of 5