#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n=50;
    int a[205];
    int b[25]={0};
    for (int i =0;i<n;i++)
    {
        cin >> a[i];
        b[a[i]]++;
    }
    int m=b[0];
    for (int i =0;i<=19;i++)
    {
        if (b[i]>m) m = b[i];
    } 
    cout << m;
     
 
 
    return 0;
}
/**************************************************************
	Problem: 1180
	User: mariooo
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/