#include<cstdio>

#include<algorithm>

#include<cstring>

using namespace std;

const int maxn = 50000 + 10;

int a[maxn],s[maxn];

int f[10],n,ans;

int main() {

    for(int i=1;i<7;i++) f[i]=-1;

    scanf("%d",&n);

    for(int i=1;i<=n;i++) {

        scanf("%d",&a[i]);

        s[i]=(s[i-1]+a[i])%7;

        if(f[s[i]]==-1) f[s[i]]=i;

        else {

            ans=max(ans,i-f[s[i]]);

        }

    }

    printf("%d\n",ans);

}