#! /usr/bin/python
from heapq import *

f = open('rucsac.in','r')
pairs = f.readline().split()
weight = int(pairs[1])
elements = int(pairs[0])
data = []
for i in range(elements):
	pairs = f.readline().split()
	data.append( (float(float(pairs[0])/float(pairs[1])), float(pairs[0]), float(pairs[1]),));

heap = []

for item in data:
	heappush(heap, item)

total = 0
value = 0
peak = []
#peak = [(weight/value), weight, value] - because python has only minheap
while heap and total<weight:
	peak = heappop(heap)
	# print peak
	total+=peak[1]
	value+=peak[2]

# value - peak[2], total - peak[2](remove last value inserted)

total -= peak[1]
value -= peak[2]
remaining_weight = weight - total
percentage_to_add = float(remaining_weight * 100 / 3)
value += float(percentage_to_add * peak[2] / 100)

print "weight: "+str(weight), "\nvalue: "+str(value)