if let N: Int = Int(readLine() ?? "0")
{
    var house: [[Int]] = []
    house.append(Array(repeating: 1, count: N+1))

    for _ in 1...N {
        if let line = readLine(),
           let row: [Int] = [1] + line.split(separator: " ").compactMap({Int($0)}) as? [Int],
           row.count == N+1
        {
            house.append(row)
        }
    }
    
    var dp:[[[Int]]] = Array(repeating: Array(repeating: Array(repeating: 0, count: N+1), count: N+1), count: 3)
    // dp[dir][y][x], dir: 가로(0) 세로(1) 대각선(2)
    dp[0][1][2] = 1
    
    for y in 1...N {
        for x in 1...N {
            if x == 2 && y == 1 {
                continue
            }
            
            if house[y][x] == 0 {
                dp[0][y][x] = dp[0][y][x-1] + dp[2][y][x-1] // 가로
                dp[1][y][x] = dp[1][y-1][x] + dp[2][y-1][x] // 세로
                
                if house[y-1][x] == 0 && house[y][x-1] == 0 {
                    dp[2][y][x] = dp[0][y-1][x-1] + dp[1][y-1][x-1] + dp[2][y-1][x-1]
                } // 대각선
            }
        }
    }
    
    print(dp[0][N][N] + dp[1][N][N] + dp[2][N][N])
}