def findgreatest$($alist$)$:

greatest $=$ float$("-$Inf"$)$

for x in alist:

if greatest $<$ x:

greatest $=$ x

return greatest

def calculate$($alist$1,$ alist$2)$:

result $=0$

for i in range$($len$($alist$1))$:

for j in range$($len$($alist$2))$:

result $+=$ alist$1[$i$]*$alist$2[$j$]$

return result