Problem: PolandBall is a young, clever Ball. He is interested in prime numbers. He has stated a following hypothesis: "There exists such a positive integer n that for each positive integer m number n·m + 1 is a prime number".

Unfortunately, PolandBall is not experienced yet and doesn't know that his hypothesis is incorrect. Could you prove it wrong? Write a program that finds a counterexample for any n.

Input

The only number in the input is n (1 ≤ n ≤ 1000) — number from the PolandBall's hypothesis. 

Output

Output such m that n·m + 1 is not a prime number. Your answer will be considered correct if you output any suitable m such that 1 ≤ m ≤ 103. It is guaranteed the the answer exists.

Examples

Input

3


Output

1

Input

4


Output

2

Note

A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself.

For the first sample testcase, 3·1 + 1 = 4. We can output 1.

In the second sample testcase, 4·1 + 1 = 5. We cannot output 1 because 5 is prime. However, m = 2 is okay since 4·2 + 1 = 9, which is not a prime number.

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
bool Is_Prime(int x) {
  int s;
  s = sqrt((double)(x));
  for (int i = 2; i <= s; i++) {
    if (x % i == 0) {
      return false;
    }
  }
  return true;
}
int main() {
  int n;
  cin >> n;
  if (n % 2 == 1) {
    if (n == 1) {
      cout << 3;
    } else {
      cout << 1;
    }
  } else {
    int index;
    index = 1;
    while (true) {
      if (Is_Prime(n * index + 1) == false) {
        cout << index;
        break;
      }
      index++;
    }
  }
  return 0;
}