#include <iostream>

using namespace std;

int m[1000][1000];
int main() {
    int a, b,c,m1,m2,m3;
    cin >> a >> b;
    cin>>c;
    for (int i=0;i<c;i++) {
        cin>>m1>>m2>>m3;
        if ((m1==1) && (m2<a) && (m2!=0) && (m3!=0) && (m3<b) && (m[m2][m3]==0)&& (m[m2-1][m3]==0)&& (m[m2][m3-1]==0)) {m[m2][m3]=1; m[m2-1][m3]=1; m[m2][m3-1]=1; }
        if ((m1==2) && (m2<a) && (m2!=0) && (m3!=0) && (m3<b) && (m[m2-1][m3-1]==0)&& (m[m2][m3]==0)&& (m[m2-1][m3]==0)) {m[m2-1][m3-1]=1; m[m2][m3]=1; m[m2-1][m3]=1; }
        if ((m1==3) && (m2<a) && (m2!=0) && (m3!=0) && (m3<b) && (m[m2][m3]==0)&& (m[m2][m3-1]==0)&& (m[m2-1][m3-1]==0)) {m[m2][m3]=1; m[m2][m3-1]=1; m[m2-1][m3-1]=1; }
        if ((m1==4) && (m2<a) && (m2!=0) && (m3!=0) && (m3<b) && (m[m2-1][m3-1]==0)&& (m[m2-1][m3]==0)&& (m[m2][m3-1]==0)) {m[m2-1][m3-1]=1; m[m2-1][m3]=1; m[m2][m3-1]=1; }
    }
    int ans=0;
    for (int i=0;i<b;i++) {
        for (int j=0;j<a;j++) if (m[i][j]==1) ans++;
    }
    cout<<ans;
    return 0;

}