#include<bits/stdc++.h>
using namespace std;
const int N=5e4+6;
int A[N],pre[N],n,ans;
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>A[i];
		pre[i]=pre[i-1]+A[i];
	} 
	for (int l=1;l<=n;l++){
	for (int r=l+1;r<=n;r++)
	{
		int idhe=pre[r]-pre[l-1];
		if(idhe%7==0){
			ans=max(ans,r-l+1);
		}
	}
	}
	cout<<ans;
}