#include <iostream>
using namespace std;
int main() {    
int a[20] = {0}; 
int x;
for (int k = 0; k < 50; k++) {        
cin >> x;        
a[x]++;
    }
    int m = 0;
for (int t = 0; t < 20; t++) {        
if (a[t] > m) {            
m = a[t];
        }
    }
    cout << m << endl;    
return 0;
/**************************************************************
	Problem: 1180
	User: HUANGYIBO
	Language: C++
	Result: Compile Error
****************************************************************/