num=int(input())
n= list(map(int,input().split()))
ev=[]
od=[]
for l in range(num):
if n[l]%2==0:
ev.append(l)
else:
od.append(l)
if len(od) > 1 and len(ev) > 0:
print(ev[0] + 1)
break
elif len(ev)>1 and len(od)>0:
print(od[0]+1)
break479C - Exams | 1030A - In Search of an Easy Problem |
158A - Next Round | 71A - Way Too Long Words |
160A - Twins | 1A - Theatre Square |
1614B - Divan and a New Project | 791A - Bear and Big Brother |
1452A - Robot Program | 344A - Magnets |
96A - Football | 702B - Powers of Two |
1036A - Function Height | 443A - Anton and Letters |
1478B - Nezzar and Lucky Number | 228A - Is your horseshoe on the other hoof |
122A - Lucky Division | 1611C - Polycarp Recovers the Permutation |
432A - Choosing Teams | 758A - Holiday Of Equality |
1650C - Weight of the System of Nested Segments | 1097A - Gennady and a Card Game |
248A - Cupboards | 1641A - Great Sequence |
1537A - Arithmetic Array | 1370A - Maximum GCD |
149A - Business trip | 34A - Reconnaissance 2 |
59A - Word | 462B - Appleman and Card Game |