#include<bits/stdc++.h>
using namespace std;
long long n,today,days,ans,m;
int main()
{
	cin>>n;
	for(int i=0; i<n; i++)
		{
			cin>>today;
			if(today==1)
				{
					days-=m;
					if(days<0) days=0;
					days++;
					ans++;
					m=0;
					if(days>=3) ans++;
					if(days>=7) ans++;
					if(days>=30) ans++;
					if(days>=120) ans++;
					if(days>=365) ans++;
				}
			else if(today==0) m++;
		}
	cout<<ans;
	return 0;
}

80分