#include<bits/stdc++.h>
using namespace std;
int a[105][105];
int main()
{
    int n;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
    	for(int j=1;j<=i;j++)
    	{
    		cin>>a[i][j];
		}
	}
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=n;j++)
		{
			cout<<a[i][j]<<" ";
		}
		cout<<endl;
	}
	for(int i=n-1;i>=1;i--) 
	{
		for(int j=1;j<=i;j++)
		{
			if(a[i+1][j]>=a[i+1][j+1])
			{
				a[i][j]+=a[i+1][j];
			}
			else
			{
				a[i][j]+=a[i+1][j+1];
			}
		}
	}
    cout<<a[1][1];
	return 0;
}
/**************************************************************
	Problem: 1216
	User: chenkexin
	Language: C++
	Result: Output Limit Exceed
****************************************************************/