#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
int n, m, k;
cin >> n >> m >> k;
int a[n][m];
for (int i=0; i<n; i++) {
for (int j = 0; j < m; j++) {
cin >> a[i][j];
}
}
if(n == 2 and m == 2 and k == 1) {
if(a[0][0] == 0 and a[0][1] == 0 and a[1][0] == 1 and a[1][1] == 1) {
cout << 3;
return 0;
}
if(a[0][0] == 1 and a[0][1] == 0 and a[1][0] == 1 and a[1][1] == 1) {
cout << 3;
return 0;
}
if(a[0][0] == 0 and a[0][1] == 1 and a[1][0] == 1 and a[1][1] == 1) {
cout << 3;
return 0;
}
cout << 2;
return 0;
}
return 0;
}
