UVa 10703

#include<bits/stdc++.h>
using namespace std;
bool taken[509][509];

int main()
{
    int W, H, N;
    while (cin>>W>>H>>N,W){
        while (N--){
            int x1,y1,x2,y2;
            cin>>x1>>y1>>x2>>y2;
            if(x1>x2)
                swap(x1,x2);
            if (y1>y2)
                swap(y1,y2);
            for(int y=y1-1;y<y2;y++)
                for(int x=x1-1;x<x2;x++)
                    taken[y][x]=true;
        }
        int cnt=0;

        for (int y=0;y<H;y++){
            for (int x=0;x<W;x++){
                if (!taken[y][x])
                    cnt++;
                else
                    taken[y][x]=false;
            }
        }
        if (cnt==0)
            cout<<"There is no empty spots.\n";
        else if (cnt==1)
            cout<<"There is one empty spot.\n";
        else
            cout<<"There are "<<cnt<<" empty spots.\n";
    }
    return 0;
}