~/algor $ cat masalalar/juft-sonlar-yigindisi
For-10
Juft sonlar yig'indisi
Muallif:
Iqbolshoh Ilhomjonov
Oson
1000 ms
64 MB
23%
Natural son $N$ berilgan. $1$ dan $N$ gacha bo'lgan barcha juft sonlarning yig'indisini hisoblang:
$$S = 2 + 4 + 6 + \dots$$
Juft son bo'lmasa ($N = 1$), $S = 0$.
Kiruvchi ma'lumotlar
Bitta natural son $N$.
Chiquvchi ma'lumotlar
Bitta butun son — $S$.
Izoh
$1 \le N \le 10^{5}$
Misollar
Kirish #1
6
Chiqish #1
12
Kirish #2
10
Chiqish #2
30