#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <iomanip>
#include <cmath>
#include <functional>
using namespace std;
#define diff(x,y) ((x > y) ? (x - y) : (y - x))
#define us(x) ((x > 0) ? x : x * -1)
#define change(x) (x ? false : true)
#define lli long long int


int main() {
	int x;
	cin >> x;
	if (x % 2)	cout << x + 5 << endl;
	else		cout << x + 4 << endl;
	return 0;
}