#include <bits/stdc++.h>
using namespace std;
int main(){
	int a[20]={0},i,j,b,z;
	for(i=1;i<=50;i++){
		cin>>b;
		a[b]++;
	}
	z=a[0];
	for(i=0;i<20;i++){
		if(a[i]>z){
			z=a[i];
		}
	}
	cout<<z;
}

/**************************************************************
	Problem: 1180
	User: linyuhang
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/