#include<stdio.h>#include<stdlib.h>#include<string.h>#include<math.h>int dir[8][4]={{-1,0,0,1},{-1,1,1,1},{0,1,1,0},{1,1,1,-1},{1,0,0,-1},{1,-1,-1,-1},{0,-1,-1,0},{-1,-1,-1,1}}; int map[201][201];int Isxie(int x1,int y1,int x2,int y2,int c){int i;switch(c%4){case 0:if(x1>x2){for(i=x2+1;i<x1;i++)if(map[y2+i-x2][i]!=1)return 0;return 1;}else{for(i=x1+1;i<x2;i++)if(map[y1+i-x1][i]!=1)return 0;return 1;}case 1:if(y1>y2){for(i=y2+1;i<y1;i++)if(map[i][x1]!=1)return 0;return 1;}else{for(i=y1+1;i<y2;i++)if(map[i][x1]!=1)return 0;return 1;}case 2:if(x1>x2){for(i=x2+1;i<x1;i++)if(map[y2-i+x2][i]!=1)return 0;return 1;}else{for(i=x1+1;i<x2;i++)if(map[y1-i+x1][i]!=1)return 0;return 1;}case 3:if(x1>x2){for(i=x2+1;i<x1;i++)if(map[y1][i]!=1)return 0;return 1;}else{for(i=x1+1;i<x2;i++)if(map[y1][i]!=1)return 0;return 1;}}return 0;}int Is***s(int x,int y,int M,int N){int nowx1,nowx2,nowy1,nowy2,c,sum=0;for(c=0;c<8;c++){ nowx1=x;nowx2=x;nowy1=y;nowy2=y;if(nowy1+dir[c][0]<0||nowy1+dir[c][0]>M||nowx1+dir[c][1]<0||nowx1+dir[c][1]>N)continue;if(nowy2+dir[c][0]<0||nowy2+dir[c][0]>M||nowx2+dir[c][1]<0||nowx2+dir[c][1]>N)continue;nowy1=nowy1+dir[c][0];nowx1=nowx1+dir[c][1];nowy2=nowy2+dir[c][2];nowx2=nowx2+dir[c][3];if(map[nowy1][nowx1]*map[nowy2][nowx2]==0)continue;while(map[nowy1][nowx1]*map[nowy2][nowx2]==1){nowy1=nowy1+dir[c][0];nowx1=nowx1+dir[c][1];nowy2=nowy2+dir[c][2];nowx2=nowx2+dir[c][3];}if(map[nowy1][nowx1]*map[nowy2][nowx2]==0)continue;if(map[nowy1][nowx1]==1||map[nowy2][nowx2]==1)continue;if(Isxie(nowx1,nowy1,nowx2,nowy2,c))sum++;}return sum;}int Find(int N,int M){int count=0;int i,j;for(i=0;i<=M;i++)for(j=0;j<=N;j++){if(map[i][j]>1){count=count+Is***s(j,i,M,N);}else ;}return count;}int main(){int N,M,K;while(scanf("%d%d%d",&M,&N,&K)!=EOF){int i,j;memset(map,0,sizeof(map));for(i=0;i<=4*N;i++){map[0][i]++;map[4*M][i]++;}for(i=0;i<=4*M;i++){map[i][0]++;map[i][4*N]++;}while(K--){int x1,x2,y1,y2;scanf("%d%d%d%d",&y1,&x1,&y2,&x2);int t=(y2-y1)*(x2-x1);if(t==0){if(x1==x2){if(y1<y2)for(j=4*y1;j<=4*y2;j++)map[j][4*x1]++;elsefor(j=4*y2;j<=4*y1;j++)map[j][4*x1]++;}else{if(x1<x2)for(j=4*x1;j<=4*x2;j++)map[4*y1][j]++;elsefor(j=4*x2;j<=4*x1;j++)map[4*y1][j]++;}}else if(t>0){if(x1<x2)for(j=4*x1;j<=4*x2;j++)map[4*y1-4*x1+j][j]++;elsefor(j=4*x2;j<=4*x1;j++)map[4*y2-4*x2+j][j]++;}else if(t<0){if(x1<x2)for(j=4*x1;j<=4*x2;j++)map[4*y1+4*x1-j][j]++;elsefor(j=4*x2;j<=4*x1;j++)map[4*y2+4*x2-j][j]++;}else ;}printf("%dn",Find(4*N,4*M));}return 0;}
