#include <iostream>
#include <cmath>
#include <vector>
#include <iomanip>

using namespace std;

constexpr double EPS = 1e-9;

int n, m, si, sj, ei, ej;
vector<vector<int>> mat;
double a;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    cin>>m>>n>>sj>>si>>ej>>ei;
    m /= 2, n /= 2, si /= 2, sj /= 2, ei /= 2, ej /= 2;

    mat.resize(n);

    for (int i = 0; i < n; ++i) {
        mat[i].resize(m);
        for (int j = 0; j < m; ++j) {
            cin>>mat[i][j];
        }
    }

    if (abs(ej - sj) > abs(ei - si)) {
        vector<vector<int>> tmat;
        tmat.resize(m);
        for (int i = 0; i < m; ++i) {
            tmat[i].resize(n);
            for (int j = 0; j < n; ++j) {
                tmat[i][j] = mat[j][i];
            }
        }
        swap(n, m);
        swap(tmat, mat);
        swap(si, sj);
        swap(ei, ej);
    }

    if (ei < si) {
        swap(ei, si);
        swap(ej, sj);
    }

//    cout<<endl<<si<<' '<<sj<<' '<<ei<<' '<<ej<<endl<<endl;
//    for (int i = 0; i < n; ++i) {
//        for (int j = 0; j < m; ++j) {
//            cout<<mat[i][j]<<' ';
//        }
//        cout<<endl;
//    }
//    cout<<endl;

    a = double(ej - sj) / (ei - si);
    int sum = 0;

    for (int i = si; i < ei; ++i) {
        int j1 = round(sj + a * (i - si));
        double j2 = sj + a * (i + 0.5 - si);
        int j3 = round(sj + a * (i + 1 - si));
        int prv = sum;

        if (j1 == j3) {
            sum += abs(mat[i + 1][j3] - mat[i][j1]);
        } else if ((a > 0 && j2 < j1 + 0.5 - EPS) || (a < 0 && j2 > j1 - 0.5 + EPS)) {
            sum += abs(mat[i + 1][j3] - mat[i + 1][j1]) + abs(mat[i + 1][j1] - mat[i][j1]);
        } else if ((a > 0 && j2 > j1 + 0.5 + EPS) || (a < 0 && j2 < j1 - 0.5 - EPS)) {
            sum += abs(mat[i + 1][j3] - mat[i][j3]) + abs(mat[i][j3] - mat[i][j1]);
        } else {
            sum += min(abs(mat[i + 1][j3] - mat[i + 1][j1]) + abs(mat[i + 1][j1] - mat[i][j1]), abs(mat[i + 1][j3] - mat[i][j3]) + abs(mat[i][j3] - mat[i][j1]));
        }
//        cout<<j1<<' '<<j2<<' '<<j3<<' '<<sum - prv<<endl;
    }

    cout<<fixed<<setprecision(10)<<sum + 2 * hypot(ei - si, ej - sj)<<endl;
}