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# include <bits/stdc++.h>
using namespace std ;
const int N = 125 ;
int n ; // 边长
int ans = INT_MIN ;
int a [ N ] [ N ] ; // 记录矩形
int s [ N ] ; // s[k]表示[i,j]行范围内第k列的前缀和
int dp [ N ] ;
void getDp ( ) {
memset ( dp , 0 , sizeof dp ) ;
for ( int i = 1 ; i < = n ; i + + ) {
dp [ i ] = max ( s [ i ] , dp [ i - 1 ] + s [ i ] ) ; // 只有当前列，
ans = max ( ans , dp [ i ] ) ;
}
}
int main ( ) {
cin > > n ;
for ( int i = 1 ; i < = n ; i + + )
for ( int j = 1 ; j < = n ; j + + )
cin > > a [ i ] [ j ] ;
for ( int i = 1 ; i < = n ; i + + ) { // 枚举起始行
memset ( s , 0 , sizeof s ) ; // 重置前缀数组
for ( int j = i ; j < = n ; j + + ) { // 枚举末尾行
for ( int k = 1 ; k < = n ; k + + ) // 枚举列
s [ k ] + = a [ j ] [ k ] ;
getDp ( ) ;
}
}
cout < < ans < < endl ;
return 0 ;
}
