#include<bits/stdc++.h>
using namespace std;
int main()
{
    long long a,s,ans=0,sum=0;
    cin>>a;
    for(int i=1;i<=a;i++)
    {
        cin>>s;
        sum=ans;
        ans=0;
        while(s!=0)
        {
            ans+=s%10;
            s/=10;            
        }
       if(ans>sum)
       {
            sum=ans;
       }
    }
    cout<<sum<<endl;
    return 0;
}