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Julia, 44 bytes - 25 = 19

r=readline()
n=r>""?int(r):2
print("@"^44n)

This reads a line from STDIN using readline(). If it's empty, i.e. no input has been provided, then n is defined to be the input converted to an integer. Otherwise n is 2. We then print 44​n @s to STDOUT.