#!/usr/bin/python3
"""
5-main
"""
island_perimeter = __import__('5-island_perimeter').island_perimeter

if __name__ == "__main__":
    grid = [[0,1,0,0],
            [1,1,1,0],
            [0,1,0,0],
            [1,1,0,0]]
    print(island_perimeter(grid))
