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



/**************************************************************
	Problem: 1180
	User: lvrenxiang
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/