$${ 4 }^{ 13 } + { 4 }^{ 13 } + { 4 }^{ 13 } + { 4 }^{ 13 }$$
$268435456$
$$67108864+4^{13}+4^{13}+4^{13}$$
$$67108864+67108864+4^{13}+4^{13}$$
$$134217728+4^{13}+4^{13}$$
$$134217728+67108864+4^{13}$$
$$201326592+4^{13}$$
$$201326592+67108864$$
$$268435456$$
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$2^{28}$
