public class Exer1 {
	public static void main(String[] args) {
		int n = 201;
		while(true) {
			boolean b = true;
			for(int i = 2;i < n / 2;i++) {
				if(n % i == 0) {
					b = false;
				}
			}
			if(b)
				break;
			n++;
		}
		System.out.println(n);
	}
}