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# include <bits/stdc++.h>
/*
测试用例I：
5 6
1 0 1 0 0 0
0 1 0 1 0 0
1 0 0 0 1 0
0 1 0 0 0 1
1 0 1 0 0 0
答案
4
测试用例II：
5 6
1 0 1 0 0 0
0 1 0 1 1 0
1 0 0 0 1 0
0 1 0 0 0 1
1 0 1 0 0 0
答案
3
*/
using namespace std ;
const int INF = 0x3f3f3f3f ;
const int N = 110 ;
int a [ N ] [ N ] ;
int res ;
int main ( ) {
int n , m ;
cin > > n > > m ;
for ( int i = 1 ; i < = n ; i + + )
for ( int j = 1 ; j < = m ; j + + )
cin > > a [ i ] [ j ] ;
// 1e8 =100000000
// 1500000000
for ( int i = 1 ; i < = n ; i + + ) // 1000
for ( int j = 1 ; j < = m ; j + + ) { // 1000
for ( int k = 0 ; ; k + + ) { // 1000 *SQRT(2)=1500
if ( i + k > n | | j + k > m ) break ; //越界
if ( a [ i + k ] [ j + k ] = = 0 ) break ;
//从[i,j]出发， ，
res = max ( res , k + 1 ) ;
}
}
cout < < res < < endl ;
return 0 ;
}
