Avoiding RAM

import time
start = time.time()
for i in range(10000000):
    a = 2
    b = 5
    c = 81
    a + b
    (a + b) / b
    (a + b) / b - c * a
    -((a + b) / b - c * a) * c ** ((a + b) - c)
print(time.time() - start)