Input consists of several pairs of integer numbers a and b.
Assume b ≥ 0.
For every pair a,b, print ab.
Supose, as usual, that 00 = 1.
The official statement of a problem is always the one
in the PDF document. The HTML and PNG versions of the statement
are also given to help you, but they may contain some content
that is not well displayed. In case of doubt, always use the PDF.