#include <iostream>
using namespace std;

int main() {
    int count[20] = {0};  // 初始化计数器数组，索引0-19对应数字0-19的出现次数
    int num;
    
    // 读取50个数字并统计出现次数
    for (int i = 0; i < 50; i++) {
        cin >> num;
        count[num]++;
    }
    
    // 找出最大出现次数
    int max_count = 0;
    for (int i = 0; i < 20; i++) {
        if (count[i] > max_count) {
            max_count = count[i];
        }
    }
    
    // 输出结果
    cout << max_count << endl;
    
    return 0;
}
/**************************************************************
	Problem: 1180
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/