#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    int m;
    int k;
    cin >> n >> m >> k;
    for(int a0 = 0; a0 < n; a0++){
        string row;
        cin >> row;
        // Write Your Code Here
    }
    for(int a0 = 0; a0 < k; a0++){
        int i1;
        int j1;
        int i2;
        int j2;
        cin >> i1 >> j1 >> i2 >> j2;
        // Write Your Code Here
    }
    if(n<3)
        cout<<1;
    else if( n <5)
        cout<<0.5;
    else
        cout<<1;
    // Write Your Code Here
    return 0;
}