n = int(input())
a = map(int, input().split())
f = [0, 0]
for x in a:
f[x % 2] += 1
d = min(f[0], f[1])
print(d + (f[1] - d) // 3)577A - Multiplication Table | 817C - Really Big Numbers |
1355A - Sequence with Digits | 977B - Two-gram |
993A - Two Squares | 1659D - Reverse Sort Sum |
1659A - Red Versus Blue | 1659B - Bit Flipping |
1480B - The Great Hero | 1519B - The Cake Is a Lie |
1659C - Line Empire | 515A - Drazil and Date |
1084B - Kvass and the Fair Nut | 1101A - Minimum Integer |
985D - Sand Fortress | 1279A - New Year Garland |
1279B - Verse For Santa | 202A - LLPS |
978A - Remove Duplicates | 1304A - Two Rabbits |
225A - Dice Tower | 1660D - Maximum Product Strikes Back |
1513A - Array and Peaks | 1251B - Binary Palindromes |
768B - Code For 1 | 363B - Fence |
991B - Getting an A | 246A - Buggy Sorting |
884A - Book Reading | 1180A - Alex and a Rhombus |