#include <iostream>
using namespace std;
 
int main() {
    int counts[20] = {0}; // 初始化0-19的计数器为0 
    int num;
    
    // 读取50个数字并统计每个数字出现的次数 
    for (int i = 0; i < 50; ++i) {
        cin >> num;
        counts[num]++;
    }
    
    // 找出最大的出现次数 
    int maxCount = 0;
    for (int i = 0; i < 20; ++i) {
        if (counts[i] > maxCount) {
            maxCount = counts[i];
        }
    }
    
    cout << maxCount << endl;
    return 0;
}

/**************************************************************
	Problem: 1180
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/