import sys
n = int(input())
ans = 0
for i in range(n):
    ans += float(input())
s = str(ans)
cnt = 0
flag = False
for i in range(len(s)):
    if s[i] == '.':
        sys.stdout.write(s[i])
        flag = True
        continue
    if flag:
        cnt += 1
    sys.stdout.write(s[i])
for i in range(10-cnt):
    sys.stdout.write('0')
print()