RoboContest

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

Masala #DP4T4WIVFE

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

For #13 ( Cheklov )

N butun soni berilgan (N > 0). Quyidagi yig’indini hisoblovchi dastur tuzing. S = 1.1 -1.2 + 1.3 -... (N ta qo’shiluvchi, ishoralar almashib keladi. Shart operatorlaridan, massivdan yoki [ ] amaldan foydalanmang kodda! )

Kiruvchi ma'lumotlar:

N butun sonda kiritiladi. 1≤N≤1000

Chiquvchi ma'lumotlar:

Masala javobini chop eting.

Misollar
# input.txt output.txt
1 
10
 
-0.50
2 
4
 
-0.20
3 
3
 
1.20

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