#include<cstdio>
#include<iostream>
using namespace std;
int maze[
1000][
1000];
int main(){
int n;
scanf(
"%d",&n);
int i,j;
for(i=
1;i<=n;i++)
for(j=
1;j<=i;j++)
scanf(
"%d",&maze[i][j]);
int *maxsum=maze[n];
for(i=n-
1;i>=
1;i--)
for(j=
1;j<=i;j++)
maxsum[j]=max(maxsum[j],maxsum[j+
1])+maze[i][j];
printf(
"%d",maxsum[
1]);
return 0;
}
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