S = list(map(int, input().split()))
S.sort()
ans = str(sum(S[1:5]) * 25)
if ans == "0":
    print("0.00")
    exit()
if int(ans) < 100:
    print("0." + ans)
    exit()
n = len(ans)
print(ans[:n-2] + "." + ans[n-2:])