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Python

def x_or_y(n, x, y):
"""A simple program which should return the value of x if n is
a prime number and should return the value of y otherwise.
Examples:
for x_or_y(7, 34, 12) == 34
for x_or_y(15, 8, 5) == 5
"""
if n < 2:
return y
for i in range(2, int(n ** 0.5) + 1):
if n % i == 0:
return y
return x