import re

p = re.compile("([0-9]+\\.[0-9]+[eE]-[0-9]+)[ \t\r\n]*$")

m = 0
fd = open("out.txt","r")
for c in fd:
	g = p.search(c)
	if g:
		x=eval(g.group(1))
		#if x > m:
			#print c,
		m=max(m,x)
print m*1e9