#include<bits/stdc++.h>
int n,i,a[9876],d=2e9,c,z=1;main(){scanf("%d",&n);for(;i<n;i++)scanf("%d",a+i);for(i=0;i<n;i++)a[i]-=a[i+1];for(i=0;i<n-1;i++){if(a[i]==d)c++;else{d=a[i];z=std::max(z,c);c=2;}}printf("%d\n",std::max(z,c));}