This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define LCBorz ios_base::sync_with_stdio(false); cin.tie(0);
#define all(x) x.begin(), x.end()
#define endl '\n'
const int N=42;
const int INF=1e9;
vector v(N,vector(N,0));
vector<int> dx={1,-1,0,0},dy={0,0,-1,1};
int r,c;
int solve(vector<int> a){
vector v1=v;
vector v2=v;
for(int k=0;k<2;k++){
for(int times=0;times<a[k];times++){
for(int i=1;i<=r;i++){
for(int j=1;j<=c;j++){
int c=i+dx[k];
int d=j+dy[k];
if(v1[i][j])v2[c][d]=1;
}
}
v1=v2;
}
}
vector<int> mx(r+2,-INF),mn(r+2,INF);
for(int i=1;i<=r;i++){
for(int j=1;j<=c;j++){
if(v1[i][j]){
mx[i]=max(mx[i],j);
mn[i]=min(mn[i],j);
}
}
}
int a1=0,b1=0;
for(int i=1;i<=r;i++){
if(mn[i]==INF){
return -1;
}
a1=max(a1,mn[i]-1);
b1=max(b1,c-mx[i]);
}
a.push_back(a1);
a.push_back(b1);
for(int k=2;k<3;k++){
for(int times=0;times<a[k];times++){
for(int i=1;i<=r;i++){
for(int j=1;j<=c;j++){
int c=i+dx[k];
int d=j+dy[k];
if(v1[i][j])v2[c][d]=1;
}
}
v1=v2;
}
}
int mx5=0;
for(int i=1;i<=r;i++){
int cnt5=0;
for(int j=1;j<=c;j++){
if(v1[i][j]==0){
cnt5++;
}
else{
cnt5=0;
}
mx5=max(cnt5,mx5);
}
}
//cout<<a[0]<<' '<<a[1]<<' '<<a[2]<<' '<<a[3]<<' '<<mx5<<endl;
return a1+b1+mx5;
}
int32_t main() {
LCBorz;
cin>>r>>c;
int n;cin>>n;
vector<int> a(n),b(n);
for(int i=0;i<n;i++){
cin>>a[i]>>b[i];
v[a[i]][b[i]]=1;
}
int ans=INF;
for(int i=0;i<r;i++){
for(int j=0;j<r;j++){
int tmp=solve({i,j});
if(tmp!=-1){
ans=min(ans,i+j+tmp);
}
}
}
cout<<ans<<endl;
return 0;
}
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