public static void main(String[] args) {

try (Scanner scanner = new Scanner(System.in)) {

int R = scanner.nextInt();

int C = scanner.nextInt();

int[][] matrix = new int[R][C];

for (int i = 0; i < R; i++) {

for (int j = 0; j < C; j++) {

matrix[i][j] = scanner.nextInt();

}

}

System.out.println(numberOfWays(matrix, R, C));

}

}

private static int numberOfWays(int[][] matrix, int R, int C) {

if (matrix[0][0] == 1 || matrix[R - 1][C - 1] == 1) {

return 0;

}

int[][] dp = new int[R][C];

dp[0][0] = 1;

for (int i = 1; i < R; i++) {

if (matrix[i][0] == 0) {

dp[i][0] = dp[i - 1][0];

}

}

for (int j = 1; j < C; j++) {

if (matrix[0][j] == 0) {

dp[0][j] = dp[0][j - 1];

}

}

for (int i = 1; i < R; i++) {

for (int j = 1; j < C; j++) {

if (matrix[i][j] == 0) {

dp[i][j] = dp[i - 1][j] + dp[i][j - 1];

}

}

}

return dp[R - 1][C - 1];

}