A. Gugurt donalari
Xotira: 32 MB, Vaqt: 1000 msMasala
Mendagi N ta gugurt donalari yordamida qanday eng katta sonni yasay olishimni toping.
Agar buni iloji bo'lmasa -1 ni chop eting.
Kiruvchi ma'lumotlar:
Bitta butun son \(1<=N<=10**9\)
Chiquvchi ma'lumotlar:
Bitta butun son ya'ni masalada so'ralgan son.
Misollar:
| # | INPUT.TXT | OUTPUT.TXT |
|---|---|---|
| 1 |
2 |
1 |
| 2 |
3 |
7 |