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#include <bits/stdc++.h>
using namespace std;
ifstream fin("traseu.in");
ofstream fout("traseu.out");
int a[501][501],n,m,mare=0;
int di[]={-1,0};
int dj[]={0,1};
void citire()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
fin>>a[i][j];
}
}
void afisare()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
fout<<a[i][j]<<' ';
fout<<endl;
}
}
int main()
{
int i,j;
citire();
for(i=1;i<=n;i++)
{
for(j=1;j<=n;j++)
{
for(int inou=i;inou<=n;inou++)
{
for(int jnou=j;jnou<=m;jnou++)
{
if(a[i][j]<a[inou][jnou])
{
if(mare<jnou-j+inou-i+1)
mare=jnou-j+inou-i+1;
}
}
}
}
}
fout<<mare;
}