t1 = 0 (+ 0 t1/s)
P1 = 0
a = a1 ⋅ a2 ⋅ a3 ... ⋅ a10 = 1
b = b1 ⋅ b2 ⋅ b3 ... ⋅ b10 = 1
P1 = ab, t1 = 0