```
func islandPerimeter(grid [][]int) int {
counter := 0
for i := 0; i < len(grid); i++ {
for j := 0; j < len(grid[0]); j++ {
if(grid[i][j] == 1) {
if (i - 1 < 0 || grid[i-1][j] == 0) {
counter += 1
}
if i + 1 >= len(grid) || grid[i+1][j] == 0 {
counter += 1
}
if j - 1 < 0 || grid[i][j-1] == 0 {
counter += 1
}
if j + 1 >= len(grid[0]) || grid[i][j+1] == 0 {
counter += 1
}
}
}
}
return counter;
}
```