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;
}