#import<ios>
int n,m,i,j,x,c,d,p=1<<30,a[2000];main(){for(scanf("%d",&n),m=n;n--;i++)scanf("%d",&a[i]);for(;j<m-1;j++){d=a[j+1]-a[j];c=d^p?1:c+1;x=std::max(x,c);p=d;}printf("%d",m<2?1:x+1);}