n=int(input())
a=[*map(int,input().split())]
d,z,c=2e9,0,0
for i in range(n-1):
 a[i]-=a[i+1]
 if(a[i]==d):c+=1
 else:d,z,c=a[i],max(z,c),2
print(max(z,c))