PI = 3.14159
ans = 0
for i in range(int(input())):
category, *l = input().split()
if category == "C":
r, h = float(l[0]), float(l[1])
ans = max(ans, 1/ 3 * PI * r * r * h)
elif category == "L":
r, h = float(l[0]), float(l[1])
ans = max(ans, PI * r * r * h)
else:
r = float(l[0])
ans = max(ans, 4 / 3 * PI * r**3)
print("%.3f" % ans)