# 1708.py
import math

x=2; y=5; z=7
def f (x,y,z): return x+y+z

# Qui \ e' necessario.
print x+3*x*x+math.log(4*x+\
  math.sqrt(1+x*x))

# Non e' richiesto un \.
print f(math.log(x),math.log(y),
  x+y+z)