import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args){
		// TODO ABC_085_B
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int N = sc.nextInt();

		int[] D = new int[N+1];
		Arrays.fill(D, 0);

		int i=0, j=0, tmp = 0;
		int ret = 0;

		for(i = 0;i < N; i++) {

			tmp = sc.nextInt();

			for(j=0; j<=i; j++) {
				if(D[j] == tmp) {
					break;
				} else if(D[j] == 0){
					D[j] = tmp;
					break;
				}
			}
		}
		// Scannerクラスのインスタンスをクローズ
		sc.close();

		for(i = 0;i < N+1; i++) {
			if(D[i] == 0) {
				// 出力
				ret = i;
				break;
			}
		}
		System.out.println(ret);
	}
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz