\[\boxed{\mathbf{245.}}\]
\[156 + 10 = 166\]
\[156 + 12 = 168\]
\[231 + 20 = 251\]
\[231 + 25 = 256\]
\[345 + 30 = 375\]
\[345 + 33 = 378\]
\[517 + 40 = 557\]
\[517 + 41 = 558\]