Two coins by

#!/usr/bin/python3\x0d
\x0d
def twoCoin(coin1, coin2):\x0d
   return coin1 * coin2 - coin1 -coin2\x0d
\x0d
import sys\x0d
for line in sys.stdin.readlines():\x0d
   c1, c2 = line.split()\x0d
   print(twoCoin(int(c1), int(c2)))

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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