A
10
B
10
C
10
D
10
E
10
F
10
G
10
H
10
I
10
J
10
K
10
L
10
M
10
N
10
O
10
P
10
Q
10
R
10
S
10
T
10
U
10
V
10
W
10
X
10
Y
10
Z
10
AA
10
AB
10
AC
10
AD
10
AE
10
AF
10
AG
10
AH
10
AI
10
AJ
10
AK
10
AL
10
AM
10
AN
10
AO
10
AP
10
AQ
10
AR
10
AS
10

Masala #0DBYOSBYJH

Xotira 16 MB Vaqt 1000 ms
14
Muallif: Otabek Aralov Abduxamitovich

Begin 4 (Doira uzunligi)

Doirading diametri d berilgan. Uning uzunligi aniqlansin. (Bunda \(\pi=3.14\)deb olinsin)

Kiruvchi ma'lumotlar:

Birinchi doira diametri d soni kiritiladi. \(1<=a<=10^6\)

Chiquvchi ma'lumotlar:

Masala javobini \(10^{-2}\) aniqlikda chop eting.

Misollar
# input.txt output.txt
1 
8
 
25.12
2 
12
 
37.68

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