10 lines
149 B
Python
10 lines
149 B
Python
|
n = int(input())
|
||
|
|
|
||
|
|
total = 0
|
||
|
|
for i in range(n):
|
||
|
|
into = input()
|
||
|
|
q, y = into.split(' ')
|
||
|
|
total = float(y)*float(q) + total
|
||
|
|
|
||
|
|
print(total)
|