max3.py

#!/usr/bin/env python

x = 576
y = 765
z = 657

# We want to find the maximum of: x,y,z

# First find the maximum of  x,y 
if x < y:
    M = y
else:
    M = x

# But  z  may be bigger, so
if M < z:
    M = z
    
print "M =", M