#include? < iostream >
#include? < limits >

int ?data[ 100 ][ 100 ];
int ?resu[ 100 ][ 100 ];
int ?x[ 4 ] = ? {? - 1 ,? 0 ,? 1 ,? 0 ?} ;
int ?y[ 4 ] = ? {?? 0 , - 1 ,? 0 ,? 1 ?} ;
int ?r,c;

bool ?isok(? int ?i,? int ?j?)
{
???? return ?(?i >= ? 0 ? && ?i < ?r? && ?j >= ? 0 ? && ?j < ?c?);
}

int ?DP(? int ?i,? int ?j?)
{
???? int ?max = ? 0 ;

???? if ?(?resu[i][j] != ? 0 ?)? return ?resu[i][j];

???? for ?(? int ?t = ? 0 ;?t < ? 4 ;? ++ t?)
???? {
????
???????? if ?(?isok(?i + ?x[t],?j + ?y[t]?)? && ?data[?i + ?x[t]?][?j + ?y[t]?] < ?data[i][j]?)
???????? {
???????????? int ?m = ?DP(?i + ?x[t],?j + ?y[t]?);

???????????? if ?(?m > ?max?)?max = ?m;
????????}
????}

???? return ?max + ? 1 ;
}

int ?main()
{
????scanf( " %d%d " , & r, & c);

???? for ?(? int ?i = ? 0 ;?i < ?r;? ++ i?)
???????? for ?(? int ?j = ? 0 ;?j < ?c;? ++ j?)
????????????scanf( " %d " ,? & data[i][j]?);

????memset(?resu,? 0 ,? sizeof (resu)?);

???? int ?max = ?INT_MIN;
???? for ?(? int ?i = ? 0 ;?i < ?r;? ++ i?)
???????? for ?(? int ?j = ? 0 ;?j < ?c;? ++ j?)
???????? {
????????????resu[i][j] = ?DP(i,j);

???????????? if ?(?max < ?resu[i][j]?)?max = ?resu[i][j];
????????}

????printf( " %d\n " ,?max?);

???? return ? 0 ;
}