int[] arr;

public int solution(int n, int[] lost, int[] reserve) {

// 1

int answer = n - lost.length;

// 2

arr = new int[n];

for(int r : reserve) arr[r - 1] = 1;

for(int l : lost) arr[l - 1] -= 1;

// 3

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

if (arr[i] == -1) {

if (i != 0 && arr[i - 1] == 1) {

arr[i - 1] = 0;

arr[i] = 0;

} else if (i != n - 1 && arr[i + 1] == 1) {

arr[i + 1] = 0;

arr[i] = 0;

}

}

}

// 4

int getStudentNum = lost.length;

for(int value : arr) {

if (value == -1) getStudentNum--;

}

// 5

return answer + getStudentNum;

}

public static void main(String[] args) {

Solution42862 s = new Solution42862();

System.out.println(s.solution(5, new int[] {2, 4}, new int[] {1, 3, 5}));

System.out.println(s.solution(5, new int[] {2, 4}, new int[] {3}));

System.out.println(s.solution(3, new int[] {3}, new int[] {1}));

}

}