import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Queue;


public class Main_yukicoder309 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Printer pr = new Printer(System.out);

        int r = sc.nextInt();
        int c = sc.nextInt();
        int[][] p = new int[r][c];
        int[][] s = new int[r][c];
        for (int i = 0; i < r; i++) {
        	for (int j = 0; j < c; j++) {
        		String tmp;
        		for (tmp = sc.next(); tmp.equals(""); tmp = sc.next()) {
        		}
    			p[i][j] = Integer.parseInt(tmp);
        	}
        }
        for (int i = 0; i < r; i++) {
        	for (int j = 0; j < c; j++) {
        		String tmp;
        		for (tmp = sc.next(); tmp.equals(""); tmp = sc.next()) {
        		}
        		s[i][j] = Integer.parseInt(tmp);
        	}
        }

        int n = 0x1 << c;

//        double[][][] ptmp = new double[r + 1][c][n];
        /*
        for (int i = 1; i <= r; i++) {
        	for (int k = 0; k < n; k++) {
        		int[] po = new int[c];
        		boolean[] used = new boolean[c];
        		Queue<Integer> q = new ArrayDeque<Integer>();
        		for (int l = 0; l < c; l++) {
        			if (i != 1 && (k & 0x1 << l) != 0) {
        				po[l] = 1;
        			} else {
        				po[l] = 0;
        			}
        			if (po[l] + 4 - s[i - 1][l] >= 4) {
        				ptmp[i][l][k] = (double)p[i - 1][l] / 100;
        				used[l] = true;
        				q.add(l);
        			}
        		}
        		while (!q.isEmpty()) {
        			int e = q.remove();

        			if (e - 1 >= 0) {
        				po[e - 1]++;
        				if (!used[e - 1] && po[e - 1] + 4 - s[i - 1][e - 1] >= 4) {
        					ptmp[i][e - 1][k] = (double)p[i - 1][e - 1] / 100;
        					used[e - 1] = true;
        					q.add(e - 1);
        				}
        			}
        			if (e + 1 < c) {
        				po[e + 1]++;
        				if (!used[e + 1] && po[e + 1] + 4 - s[i - 1][e + 1] >= 4) {
        					ptmp[i][e + 1][k] = (double)p[i - 1][e + 1] / 100;
        					used[e + 1] = true;
        					q.add(e + 1);
        				}
        			}
        		}
        	}
        }
        */

        double[][] dp = new double[r + 1][n];
        double dtmp = 1;
        for (int i = 0; i < c; i++) {
        	dtmp /= 2;
        }
        Arrays.fill(dp[0], dtmp);

        for (int i = 1; i <= r; i++) {
        	for (int j = 0; j < n; j++) {
        		for (int k = 0; k < n; k++) {
        			if (dp[i - 1][k] == 0) {
        				continue;
        			}

            		int[] po = new int[c];
            		boolean[] used = new boolean[c];
            		Queue<Integer> q = new ArrayDeque<Integer>();
            		double[] ptmp3 = new double[c];
        			for (int l = 0; l < c; l++) {
            			if (i != 1 && (k & 0x1 << l) != 0) {
            				po[l] = 1;
            			} else {
            				po[l] = 0;
            			}
            			if (po[l] + 4 - s[i - 1][l] >= 4) {
//            				ptmp[i][l][k] = (double)p[i - 1][l] / 100;
            				ptmp3[l] = (double)p[i - 1][l] / 100;
            				used[l] = true;
            				q.add(l);
            			}
            		}
            		while (!q.isEmpty()) {
            			int e = q.remove();

            			if ((j & 0x1 << e) == 0) {
            				continue;
            			}

            			if (e - 1 >= 0) {
            				po[e - 1]++;
            				if (!used[e - 1] && po[e - 1] + 4 - s[i - 1][e - 1] >= 4) {
//            					ptmp[i][e - 1][k] = (double)p[i - 1][e - 1] / 100;
            					ptmp3[e - 1] = (double)p[i - 1][e - 1] / 100;
            					used[e - 1] = true;
            					q.add(e - 1);
            				}
            			}
            			if (e + 1 < c) {
            				po[e + 1]++;
            				if (!used[e + 1] && po[e + 1] + 4 - s[i - 1][e + 1] >= 4) {
//            					ptmp[i][e + 1][k] = (double)p[i - 1][e + 1] / 100;
            					ptmp3[e + 1] = (double)p[i - 1][e + 1] / 100;
            					used[e + 1] = true;
            					q.add(e + 1);
            				}
            			}
            		}

        			double ptmp2 = 1.0;
        			for (int l = 0; l < c && ptmp2 != 0; l++) {
        				if ((j & 0x1 << l) != 0) {
//        					ptmp2 *= ptmp[i][l][k];
        					ptmp2 *= ptmp3[l];
        				} else {
//        					ptmp2 *= (1.0 - ptmp[i][l][k]);
        					ptmp2 *= (1.0 - ptmp3[l]);
        				}
        			}

            		dp[i][j] += ptmp2 * dp[i - 1][k];
        		}
        	}
        }

        double ret = 0;
        for (int i = 1; i <= r; i++) {
        	for (int j = 0; j < n; j++) {
        		ret += dp[i][j] * Integer.bitCount(j);
        	}
        }

        pr.printf("%.14f\n", ret);

        pr.close();
        sc.close();
    }

	@SuppressWarnings("unused")
	private static class Scanner {
		BufferedReader br;
		Iterator<String> it;

		Scanner (InputStream in) {
			br = new BufferedReader(new InputStreamReader(in));
		}

		String next() throws RuntimeException  {
			try {
				if (it == null || !it.hasNext()) {
					it = Arrays.asList(br.readLine().split(" ")).iterator();
				}
				return it.next();
			} catch (IOException e) {
				throw new IllegalStateException();
			}
		}

		int nextInt() throws RuntimeException {
			return Integer.parseInt(next());
		}

		long nextLong() throws RuntimeException {
			return Long.parseLong(next());
		}

		float nextFloat() throws RuntimeException {
			return Float.parseFloat(next());
		}

		double nextDouble() throws RuntimeException {
			return Double.parseDouble(next());
		}

		void close() {
			try {
				br.close();
			} catch (IOException e) {
//				throw new IllegalStateException();
			}
		}
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}