50A_codeforces
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def domino_pailling(l,b):
#print(l,b)
each_domino_area = 2 * 1
area = l * b
dominoes = area // each_domino_area
return dominoes
if __name__ == '__main__':
l,b = list(map(int,input().split()))
print(domino_pailling(l,b))
Python
INFO