import java.util.Scanner;
public class ObtainSubString {
public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
        	int k = sc.nextInt();//数字个数
        	String a = sc.nextLine();
        	String[] str = sc.nextLine().split(" ");
        	int n = sc.nextInt();//第三行数
        	int sum = 0;
        	int[] num = new int[k];
        	for (int i = 0;i < k;i++) {
        		num[i] = Integer.parseInt(str[i]);
				sum = sum + num[i];//总和
			}
        	int m = k;//原数组长度
        	//循环取子串去验证，子串的长度递减
        	while (sum%n != 0 && k > 0) {
				k--;//子串长度减一
				for(int i = 0;i <= m-k;i++) {//取子串，每次从第i个元素开始取长度为k的子串
					sum = 0;
					for (int j = i; j < k+i; j++) {//子序列相加和
						sum += num[j];
					}
					if (sum%n == 0) {//能整除就跳出循环
						break;
					}
				}
				
			}
        	System.out.println(k);//输出子串长度
        }
}
}