Codeforces Round #209 (Div. 2) A. Table

#include <iostream>
#include <vector>

using namespace std;

int main(){
int n,m;
cin >> n >> m;
int a[50][50];
bool flag = false;
for(int i = 0 ; i < n ; ++ i){
for(int j  = 0; j <  m ; ++ j){
cin >> a[i][j];
}
}
for(int  j = 0; j < m; ++ j){
if(a[0][j] || a[n-1][j]){
flag = true;
break;
}
}
for(int i  =0 ; i < n ; ++ i){
if(a[i][0] || a[i][m-1]){
flag = true;
break;
}
}
if(flag) cout<<2<<endl;
else cout<<4<<endl;
}