---

n, w, k= input().splitO
n = int(n)
W= float(W)
k = float(k)
factor = 1 - k
items = []
for - in range(n):
m, c= map(int, input).split())
items. append((c / m, m, c))
items.sort(reverse=True)
value = 0.0
cap = W
for ratio, m, c in items:
w= m * factor if cap <= 0: break
if w <= cap:
value += c cap -= w
else:
value += c * (cap / w)
break
print(f"Evalue: 10f}")