#include<bits/stdc++.h>
using namespace std;
int a[100050],b[100050],i,n,m;
int main(){
	//freopen("1.in","r",stdin);
	//freopen("1.out","w",stdout);
	cin>>n;
	for(i=1;i<=n;i++){
		cin>>a[i];
		while(a!=0){
			b[i]+=a[i]%10;
			a[i]/=10;
		}
	}
	sort(b+1,b+1+n);
	cout<<b[n];
    return 0;
}