sum=0
k=45
for i in range(3,0,-1):
for j in range(i+1):
if(j!=i):
sum+=k*i
else:
sum-=k
k+=1
print(sum)
c3VtPTAKaz00NQpmb3IgaSBpbiByYW5nZSgzLDAsLTEpOgoJZm9yIGogaW4gcmFuZ2UoaSsxKToKCQlpZihqIT1pKToKCQkJc3VtKz1rKmkKCQllbHNlOgoJCQlzdW0tPWsKCWsrPTEKCnByaW50KHN1bSkKCQ==