n=int(input()) a=list(map(int,input().split())) s=0 c=0 for i | CODING SOLUTION - Placement Jobs & Materials

n=int(input())
a=list(map(int,input().split()))
s=0
c=0
for i in range(len(a)):
if a[i]%4!=0:
s=s+a[i]
c=c+1
if s%4==0:
print(c//2)
else:
print(-1)

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