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Tasks_And_Deadlines.py

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####################################################################################

# Please consider trying a few more times before referring to this code.

# Code might be incorrect - TLE / Wrong Answer (especially filenames with _1 , _2)

# Pedagogical > Pythonic

####################################################################################

n = int(input())

I = lambda : map(int, input().split())

tot = 0

fin = []

for i in range(n):

a, d = I()

fin.append(a); tot += d

print(tot - sum([(idx + 1) * i for idx, i in enumerate(sorted(fin, reverse = True))]))

# I once again ask you to try a few more times before referring here