送外卖

这问题又是一道大数的题目，学好python真重要，这是python2.7.3

复制代码

while True:
    try:
        m, n = raw_input().split(' ')
        m = int(m)
        n = int(n)
    except:
        break
    if m%2 == 0 or n%2 == 0:
        print str(m*n)+'.00'
    else:
        print str(m*n)+'.41'