Πεψενθε 

 

`and`(S = `+`(`*`(8, `*`(`*`(`/`(1, 2), 6)))), `and`(`+`(`*`(8, `*`(`*`(`/`(1, 2), 6)))) = 24, 24 = `*`(r, `*`(`*`(`+`(`+`(6, 8), 10), `/`(1, 2)))))) 

r = 2