from math import sqrt

def arithmetic_mean(x, y):
    # fill in the blank

def geometric_mean(x, y):
    # fill in the blank

def harmonic_mean(x, y):
    # fill in the blank

x = int( input('Enter x: ') )
y = int( input('Enter y: ') )

print('arithmetic mean =', arithmetic_mean(x, y))
print('geometric mean  =', geometric_mean(x, y))
print('harmonic mean   =', harmonic_mean(x, y))