#include <bits/stdc++.h>
using namespace std;
long long n,x,ans=-10010,cnt=-11110;
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin>>n;
for(int i=1;i<=n;i++){
cin>>x;
cnt=max(x,cnt+x);
if(cnt%7==0){
ans=max(cnt,ans);
}
}
cout<<ans;
return 0;
}
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