import math
print("math.log(10.13) : ", math.log(10.13))
print("math.log(10.81) : ", math.log(10.81))
print("math.log(math.pi) : ", math.log(math.pi))
'''
run:
math.log(10.13) : 2.315501318260592
math.log(10.81) : 2.3804716316511167
math.log(math.pi) : 1.1447298858494002
'''