#include <iostream>
#include <stdlib.h>
//use recurrence way to find most biggest total 
using namespace std;
int sum=0;
void print_value(int a[][110],int N)							//printf the number 
{
	for(int row=1; row<=N; row++)
		for(int line=1; line<=row; line++)
			cin>>a[row][line];
}
void search(int a[][110], int i, int j, int N, int all)			//find the most biggest number
{
	all+=a[i][j];
	if(i==N)
	{
		if(sum <all )
			sum =all ;
		return ;
	}
	search(a ,i+1 ,j ,N, all);
	search(a ,i+1 ,j+1 ,N ,all);
}
int main()
{
	int N;
	cin>>N;
	int value[110][110]={0};
	print_value(value,N);
	search(value ,1 ,1 ,N , 0);
	cout<<sum<<endl;
	return 0;
}

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